Source Code

This is the source-code for the Apollo 9 Command Module's Guidance Computer. These files were derived originally from the scan from MIT's Dibner Institute's now-discontinued website titled "History of Recent Science and Technology", which in turn was originally created by Gary Neff, though his high-quality scans were unfortunately reduced in legibility when presented online. The markings on the front of the printout imply that it was the original AGC developer Norm Brodeur's copy. A scan by Ron Burkey has superceded it, made from a more-legible copy from the collection of original AGC developer Fred Martin. The source code was transcribed from those images by Ron Burkey. Note that the page images presented online are of reduced quality, and that higher-quality images are available. Report any conversion errors or legibility problems in page images to info@sandroid.org. Notations on the program listing read, in part:

	ASSEMBLE REVISION 249 OF AGC PROGRAM COLOSSUS BY NASA 2021111-041
	20'35 OCT. 28,1968
Note that the date is the date of the printout, not the date of the program revision.

035348,000002:                                                                                                  ## Copyright:   Public domain.
035349,000003:                                                                                                  ## Filename:    ENTRY_LEXICON.agc
035350,000004:                                                                                                  ## Purpose:     Part of the source code for Colossus, build 249.
035351,000005:                                                                                                  ##              It is part of the source code for the Command Module's (CM)
035352,000006:                                                                                                  ##              Apollo Guidance Computer (AGC), for Apollo 9.
035353,000007:                                                                                                  ## Assembler:   yaYUL
035354,000008:                                                                                                  ## Reference:   pp. 791-797.
035355,000009:                                                                                                  ## Contact:     Ron Burkey <info@sandroid.org>.
035356,000010:                                                                                                  ## Website:     www.ibiblio.org/apollo.
035357,000011:                                                                                                  ## Mod history: 08/19/04 RSB.   Transcribed     .
035358,000012:                                                                                                  ##              2017-01-06 RSB  Page numbers now agree with those on the
035359,000013:                                                                                                  ##                              original harcopy, as opposed to the PDF page
035360,000014:                                                                                                  ##                              numbers in 1701.pdf.
035361,000015:                                                                                                  ##              2017-01-07 RSB  Cross-diff'd comment text (not whitespace)
035362,000016:                                                                                                  ##                              vs the already-proofed corresponding Colossus
035363,000017:                                                                                                  ##                              237 and Comanche 55 source-code files
035364,000018:                                                                                                  ##                              and corrected errors found.
035365,000019:                                                                                                  ##              2017-01-22 RSB  Back-ported comment error fixes detected in diff'ing
035366,000020:                                                                                                  ##                              Artemis 72 vs Comanche 55.
035367,000021:                                                                                                  ##
035368,000022:                                                                                                  ## The contents of the "Colossus249" files, in general, are transcribed 
035369,000023:                                                                                                  ## from a scanned copy of the program listing.  Notations on this
035370,000024:                                                                                                  ## document read, in part:
035371,000025:                                                                                                  ##
035372,000026:                                                                                                  ##      Assemble revision 249 of AGC program Colossus by NASA
035373,000027:                                                                                                  ##      2021111-041.  October 28, 1968.  
035374,000028:                                                                                                  ##
035375,000029:                                                                                                  ##      This AGC program shall also be referred to as
035376,000030:                                                                                                  ##                              Colossus 1A
035377,000031:                                                                                                  ##
035378,000032:                                                                                                  ##      Prepared by
035379,000033:                                                                                                  ##                      Massachusetts Institute of Technology
035380,000034:                                                                                                  ##                      75 Cambridge Parkway
035381,000035:                                                                                                  ##                      Cambridge, Massachusetts
035382,000036:                                                                                                  ##      under NASA contract NAS 9-4065.
035383,000037:                                                                                                  ##
035384,000038:                                                                                                  ## Refer directly to the online document mentioned above for further information.
035385,000039:                                                                                                  ## Please report any errors (relative to the scanned pages) to info@sandroid.org.
035386,000040:                                                                                                  ##
035387,000041:                                                                                                  ## In some cases, where the source code for Luminary 131 overlaps that of 
035388,000042:                                                                                                  ## Colossus 249, this code is instead copied from the corresponding Luminary 131
035389,000043:                                                                                                  ## source file, and then is proofed to incorporate any changes.
035390,000044: 

Page 791

035392,000046:                                                                                                  #  VARIABLE      DESCRIPTION                             MAXIMUM VALUE *         COMPUTER NAME
035393,000047:                                                                                                  #  --------      -----------                             ------- -----           -------- ----
035394,000048:                                                                                                  #  -
035395,000049:                                                                                                  #  URT0          INITIAL TARGET VECTOR                   2 (UNIT VECTOR)         = RTINIT
035396,000050:                                                                                                  #  -
035397,000051:                                                                                                  #  UZ            UNIT VECTOR NORTH                       1                       = UNITW
035398,000052:                                                                                                  #  -
035399,000053:                                                                                                  #  V             VELOCITY VECTOR                         2 VSAT                  = VEL
035400,000054:                                                                                                  #  -
035401,000055:                                                                                                  #  R             POSITION VECTOR                         2 EXP 29 METERS         = RN
035402,000056:                                                                                                  #  -
035403,000057:                                                                                                  #  VI            INERTIAL VELOCITY                       128 M/CENTISEC          = VN
035404,000058:                                                                                                  #  -
035405,000059:                                                                                                  #  RTE           VECTOR EAST AT INITIAL TARGET           2                       = RTEAST
035406,000060:                                                                                                  #  -
035407,000061:                                                                                                  #  UTR           NORMAL TO RTE AND UZ                    2                       = RTNORM
035408,000062:                                                                                                  #  -
035409,000063:                                                                                                  #  URT           TARGET VECTOR                           2                       = RT
035410,000064:                                                                                                  #  -
035411,000065:                                                                                                  #  UNI           UNIT NORMAL TO TRAJECTORY PLANE         2       
035412,000066:                                                                                                  #  -
035413,000067:                                                                                                  #  DELV          INTEGRATED ACCEL. FROM PIPAS            5.85 16384 CM/S
035414,000068:                                                                                                  #  -
035415,000069:                                                                                                  #  G             GRAVITY VECTOR                          128 M/CENTISEC          = GDT/2
035416,000070: 
035417,000071:                                                                                                  #  A0            INITIAL DRAG FOR UPCONTRL               805 FPSS                FPSS=FT/SEC/SEC
035418,000072: 
035419,000073:                                                                                                  #  AHOOKDV       TERM IN GAMMAL CALC. = AHOOK DVL        16
035420,000074: 
035421,000075:                                                                                                  #  A1            DRAG VALUE IN FACTOR CALCULATION        805 FPSS
035422,000076: 
035423,000077:                                                                                                  #  ALP           CONST FOR UPCONTRL                      1
035424,000078: 
035425,000079:                                                                                                  #  ASKEP         KEPLER RANGE                            21600 NM                NM = NAUTICAL MILE
035426,000080: 
035427,000081:                                                                                                  #  ASP1          FINAL PHASE RANGE                       21600 NM
035428,000082: 
035429,000083:                                                                                                  #  ASPUP         UP-RANGE                                21600 NM
035430,000084: 
035431,000085:                                                                                                  #  ASP3          GAMMA CORRECTION                        21600 NM
035432,000086: 
035433,000087:                                                                                                  #  ASPDWN        RANGE DOWN TO PULL-UP                   21600 NM
035434,000088: 
035435,000089:                                                                                                  #  ASP           PREDICTED RANGE                         21600 NM                NOT STORED
035436,000090: 
035437,000091:                                                                                                  #  COSG          COSINE(GAMMAL)                          2                       = COSG/2
035438,000092: 
035439,000093:                                                                                                  #  C/D0          RECIPROCAL DRAG, -4/D0 B-8              64/FPSS
035440,000094: 
035441,000095:                                                                                                  #  D             TOTAL ACCELERATION                      805 FPSS
035442,000096: 
035443,000097:                                                                                                  #  D0            CONTROLLED CONSTANT D                   805 FPSS
035444,000098: 
035445,000099:                                                                                                  #  DHOOK         TERM IN GAMMAL COMPUTATION              805 FPSS
035446,000100: 
035447,000101:                                                                                                  #  DIFF          THETNM-ASP (RANGE DIFFERENCE)           21600 NM
035448,000102: 
035449,000103:                                                                                                  #  DIFFOLD       PREVIOUS VALUE OF DIFF                  21600 NM
035450,000104: 
035451,000105:                                                                                                  #  DLEWD         CHANGE IN LEWD                          1
035452,000106: 
035453,000107:                                                                                                  #  DR            REFERENCE DRAG FOR DOWNCONTROL          805 FPSS                NOT STORED
035454,000108: 
035455,000109:                                                                                                  #  DREFR         REFERENCE DRAG                          805 FPSS                NOT STORED
035456,000110: 
035457,000111:                                                                                                  #  DVL           VS1-VL                                  2 VSAT
035458,000112: 
035459,000113:                                                                                                  #  E             ECCENTRICITY                            4                       NOT STORED
035460,000114: 
035461,000115:                                                                                                  #  F1            DRANGE/D DRAG   (FINAL PHASE)           2700/805                = FX +5
035462,000116: 
035463,000117:                                                                                                  #  F2            DRANGE/D RDOT   (FINAL PHASE)           2700/2VS NM/FPS         = FX +4

Page 792

035465,000119: 
035466,000120:                                                                                                  #  F3            DRANGE/D (L/D)                          2700 NM                 = FX
035467,000121: 
035468,000122:                                                                                                  #  FACT1         CONST FOR UPCONTRL                      805 FPSS
035469,000123: 
035470,000124:                                                                                                  #  FACT2         CONST FOR UPCONTRL                      1/805 FPSS
035471,000125: 
035472,000126:                                                                                                  #  FACTOR        USED IN UPCONTRL                        1                       * MAXIMUM VALUE DENOTES UNSCALED
035473,000127:                                                                                                  #                                                                
035474,000128:                                                                                                  #  GAMMAL        FLIGHT PATH ANGLE AT VL                 1 RADIAN                  VARIABLE VALUE WHEN SCALED
035475,000129: 
035476,000130:                                                                                                  #  GAMMAL1       SIMPLE FORM OF GAMMAL                   1 RADIAN                  VARIABLE HAS MAXIMUM VALUE OF ONE.

Page 793

035478,000132:                                                                                                  #  VARIABLE      DESCRIPTION                             MAXIMUM VALUE           COMPUTER NAME
035479,000133:                                                                                                  #  --------      -----------                             ------- -----           -------- ----
035480,000134: 
035481,000135:                                                                                                  #  HEADSUP       INDICATOR FOR INITIAL ROLL              1
035482,000136: 
035483,000137:                                                                                                  #  KA            DRAG TO LIFT UP IF DOWN                 805 FPSS                = KAT
035484,000138: 
035485,000139:                                                                                                  #  KLAT          LATERAL SWITCH GAIN                     1                       (NOM = .0125)
035486,000140: 
035487,000141:                                                                                                  #  K2ROLL        INDICATOR FOR ROLL SWITCH               
035488,000142: 
035489,000143:                                                                                                  #  LAD           MAX L/D (MIN ACTUAL VEHICLE L/D)        1
035490,000144: 
035491,000145:                                                                                                  #  LADPAD        NOMINAL VEHICLE L/D, SP PAD LOAD        1                       (NOM = 0.3)
035492,000146: 
035493,000147:                                                                                                  #  LATANG        LATERAL RANGE                           4 RADIANS
035494,000148: 
035495,000149:                                                                                                  #  LEQ           EXCESS C.F. OVER GRAV=(VSQ-1)GS         128.8 FPSS
035496,000150: 
035497,000151:                                                                                                  #  LEWD          UPCONTROL REFERENCE L/D                 1
035498,000152: 
035499,000153:                                                                                                  #  LOD           FINAL PHASE L/D                         1                       (NOM = 0.18)
035500,000154: 
035501,000155:                                                                                                  #  LODPAD        FINAL PHASE L/D, SP PAD LOAD            1
035502,000156: 
035503,000157:                                                                                                  #  L/D           DESIRED LIFT TO DRAG RATIO              1
035504,000158:                                                                                                  #                (VERTICAL PLANE)
035505,000159:                                                                                                  #  
035506,000160:                                                                                                  #  L/D1          TEMP STORAGE FOR L/D IN LATERAL         1
035507,000161: 
035508,000162:                                                                                                  #  L/DCMINR      LAD COS(15DEG)                          1                       (NOM = 0.2895)
035509,000163: 
035510,000164:                                                                                                  #  PREDANGL      PREDICTED RANGE (FINAL PHASE)           2700 NM                 = PREDANG
035511,000165: 
035512,000166:                                                                                                  #  Q2            FINAL PHASE RANGE -23500 Q3             21600 NM
035513,000167:                                                                                                  #                Q2 = FCN(LAD)
035514,000168: 
035515,000169:                                                                                                  #  Q7            MINIMUM DRAG FOR UPCONTROL              805FPSS
035516,000170: 
035517,000171:                                                                                                  #  RDOT          ALTITUDE RATE                           2 VSAT
035518,000172: 
035519,000173:                                                                                                  #  RDOTREF       REFERENCE RDOT FOR UPCONTROL            2 VSAT
035520,000174: 
035521,000175:                                                                                                  #  RDTR          REFERENCE RDOT FOR DOWNCONT             2 VSAT                  NOT SAVED
035522,000176: 
035523,000177:                                                                                                  #  ROLLC         ROLL COMMAND                            1 REVOLUTION
035524,000178: 
035525,000179:                                                                                                  #  RTOGO         RANGE TO GO (FINAL PHASE)               2700 NM                 = FX +2
035526,000180: 
035527,000181:                                                                                                  #  SL            SINE OF LATITUDE                        1                       NOT SAVED
035528,000182: 
035529,000183:                                                                                                  #  T             TIME                                    B 28 CENTISEC           = TIME2,TIME1
035530,000184: 
035531,000185:                                                                                                  #  THETA         DESIRED RANGE (RADIANS)                 2 PI RADIANS            = THETAH
035532,000186: 
035533,000187:                                                                                                  #  THETNM        DESIRED RANGE (NM)                      21600 NM                NON EXISTENT
035534,000188: 
035535,000189:                                                                                                  #  V             VELOCITY MAGNITUDE                      2 VSAT
035536,000190:                                                                                                  #  
035537,000191:                                                                                                  #  V1            INITIAL VELOCITY FOR UPCONTROL          2 VSAT
035538,000192: 
035539,000193:                                                                                                  #  VL            EXIT VELOCITY FOR UPCONTROL             2 VSAT
035540,000194: 
035541,000195:                                                                                                  #  VREF          REFERENCE VELOCITY FOR UPCONTROL        2 VSAT
035542,000196: 
035543,000197:                                                                                                  #  VS1           VSAT OR V1, WHICHEVER IS SMALLER        2 VSAT
035544,000198:                                                                                                  #                  2     2
035545,000199:                                                                                                  #  VBARS         VL /VSAT                                4
035546,000200:                                                                                                  #                                           2     2
035547,000201:                                                                                                  #  VSQ           NORMALISED VEL. SQUARED = V /VSAT       4                       = VSQUARE
035548,000202: 
035549,000203:                                                                                                  #  WT            EARTH RATE TIMES TIME                   1 REVOLUTION            NOT SAVED
035550,000204:                                                                                                  #                                                                                = WIE (DTEAROT)
035551,000205:                                                                                                  #  X             INTERMEDIATE VARIABLE IN G-LIMITER      2 VSAT                  NOT SAVED
035552,000206: 
035553,000207:                                                                                                  #  Y             LATERAL MISS LIMIT                      4 RADIANS               NOT SAVED
035554,000208: 

Page 794

035556,000210:                                                                                                  #  EXTRA COMPUTER ERASABLE LOCATIONS NOT SHOWN ON FLOW CHARTS
035557,000211:                                                                                                  #  -----------------------------------------------------------
035558,000212: 
035559,000213:                                                                                                  #  VARIABLE      DESCRIPTION                             MAXIMUM VALUE
035560,000214:                                                                                                  #  --------      -----------                             ------- -----
035561,000215: 
035562,000216:                                                                                                  #  GOTOADDR      ADDRESS SELECTED BY SEQUENCER
035563,000217: 
035564,000218:                                                                                                  #  XPIPBUF       BUFFER TO STORE X PIPA COUNTS
035565,000219: 
035566,000220:                                                                                                  #  YPIPBUF       BUFFER TO STORE Y PIPA COUNTS
035567,000221: 
035568,000222:                                                                                                  #  ZPIPBUF       BUFFER TO STORE Z PIPA COUNTS
035569,000223: 
035570,000224:                                                                                                  #  PIPCTR        COUNTS PASSES THRU PIPA READ ROUTINE
035571,000225: 
035572,000226:                                                                                                  #  JJ            INDEX IN FINAL PHASE TABLE LOOK-UP
035573,000227: 
035574,000228:                                                                                                  #  MM            INDEX IN FINAL PHASE TABLE LOOK-UP
035575,000229: 
035576,000230:                                                                                                  #  GRAD          INTERPOLATION FACTOR IN FINAL PHASE
035577,000231: 
035578,000232:                                                                                                  #  FX            DRANGE/D L/D = F3                       2700 NM
035579,000233: 
035580,000234:                                                                                                  #  FX +1         AREF                                    805 FPSS
035581,000235: 
035582,000236:                                                                                                  #  FX +2         RTOGO                                   2700 NM
035583,000237: 
035584,000238:                                                                                                  #  FX +3         RDOTREF                                 VSAT/4
035585,000239: 
035586,000240:                                                                                                  #  FX +4         DRANGE/D RDOT = F2                      21600/2VS NM/FPS
035587,000241: 
035588,000242:                                                                                                  #  FX +5         DRANGE/D DRAG = F1                      2700/805 NM/FPSS
035589,000243: 
035590,000244:                                                                                                  #  TEM1B         TEMPORARY LOCATION
035591,000245: 
035592,000246:                                                                                                  #  TIME/RTO      TIME OF INITIAL TARGET RTINIT           B 28 CENTISEC
035593,000247: 
035594,000248:                                                                                                  #  DTEAROT       EST TIME BETWEEN RTINIT AND RT          B 28 CENTISEC
035595,000249:                                                                                                  #  -
035596,000250:                                                                                                  #  UNITV         UNIT V VECTOR                           2
035597,000251:                                                                                                  #  -
035598,000252:                                                                                                  #  UNITR         UNIT R VECTOR                           2
035599,000253:                                                                                                  #   -
035600,000254:                                                                                                  #  -VREL         NEGATIVE VELOCITY REL TO ATMOSP         2 VSAT
035601,000255: 
035602,000256:                                                                                                  #  COMPUTER SWITCHES                                     INITIAL STATE           CM/FLAGS = STATE +6
035603,000257:                                                                                                  #  -------- --------                                     -------------           -------------------
035604,000258: 
035605,000259:                                                                                                  #  ENTRYDSP      DO ENTRY DISPLAY, IF SET                NON-BRANCH (1)          92D, BIT 13
035606,000260:                                                                                                  #  GONEPAST      INDICATES OVERSHOOT OF TARGET           NON-BRANCH (0)          95D, BIT 10
035607,000261:                                                                                                  #  RELVELSW      RELATIVE VELOCITY SWITCH                NON-BRANCH (0)          96D, BIT 9
035608,000262:                                                                                                  #  EGSW          FINAL PHASE SWITCH                      NON-BRANCH (0)          97D, BIT 8
035609,000263:                                                                                                  #  FIRSTPAS      INITIAL PASS THRU HUNTEST               NON-BRANCH (0)          98D, BIT 7
035610,000264:                                                                                                  #  HIND          INDICATES ITERATION IN HUNTEST          NON-BRANCH (0)          99D, BIT 6
035611,000265:                                                                                                  #  INRLSW        INDICATES INIT ROLL ATTITUDE SET        NON-BRANCH (0)          100D, BIT 5
035612,000266:                                                                                                  #  LATSW         INHIBIT DOWNLIFT SWITCH IF NOT SET          BRANCH (1)          101D, BIT 4
035613,000267:                                                                                                  #  .05GSW        INDICATES DRAG EXCEEDS .05 GS               BRANCH (0)          102D, BIT 3
035614,000268: 
035615,000269:                                                                                                  #  GONEBY        INDICATES GONE PAST TARGET (SET)        SELF-INITIALZNG         112D, BIT 8
035616,000270: 

Page 795

035618,000272:                                                                                                  #  CONSTANTS AND GAINS                                                   VALUE
035619,000273:                                                                                                  #  -------------------                                                   -----
035620,000274: 
035621,000275:                                                                                                  #  C1            FACTOR IN ALP COMPUTATION                               1.25
035622,000276:                                                                                                  #  C16           CONSTD GAIN ON DRAG                                     .01
035623,000277:                                                                                                  #  C17           CONSTD GAIN ON RDOT                                     .001
035624,000278:                                                                                                  #  C18           BIAS VEL. FOR FINAL PHASE START                         500     FPS
035625,000279:                                                                                                  #  C20           MAX DRAG FOR DOWN-LIFT                                  175     FPSS
035626,000280:                                                                                                  #  CHOOK         FACTOR IN AHOOK COMPUTATION                             .25
035627,000281:                                                                                                  #  CH1           FACTOR IN GAMMAL COMPUTATION                            1.0
035628,000282:                                                                                                  #  COS15         COS( 15 DEG )                                           .965
035629,000283:                                                                                                  #  DLEWD0        INITIAL VARIATION IN LEWD                               -.05
035630,000284:                                                                                                  #  D2            DRAG TO CHANGE LEWD                                     175     FPSS
035631,000285:                                                                                                  #  DT            COMPUTATION CYCLE TIME INTERVAL                         2       SEC.
035632,000286:                                                                                                  #  GMAX          MAXIMUM ACCELERATION                                    257.6   FPSS    (8 G-S)
035633,000287:                                                                                                  #  KA1           FACTOR IN KA CALC                                       1.3     GS
035634,000288:                                                                                                  #  KA2           FACTOR IN KA CALC                                       .2      GS
035635,000289:                                                                                                  #  KA3           FACTOR IN D0 CALC                                       90 FPSS
035636,000290:                                                                                                  #  KA4           FACTOR IN D0 CALC                                       40 FPSS
035637,000291:                                                                                                  #  KB1           OPTIMIZED UPCONTROL GAIN                                3.4
035638,000292:                                                                                                  #  KB2           OPTIMIZED UPCONTROL GAIN                                .0034
035639,000293:                                                                                                  #  KDMIN         INCREMENT ON Q7 TO DETECT END OF KEPLER PHASE           .5      FPSS
035640,000294:                                                                                                  #  KTETA         TIME OF FLIGHT CONSTANT                                 1000
035641,000295:                                                                                                  #  KLAT1         FACTOR IN KLAT CALC                                     1/24
035642,000296:                                                                                                  #  K44           GAIN USED IN INITIAL ROLL SECTION                       19749550 FPS
035643,000297:                                                                                                  #  LATBIAS       LATERAL SWITCH BIAS TERM                                .41252961 NM
035644,000298:                                                                                                  #  LEWD1         NOMINAL UPCONTROL L/D                                   .15
035645,000299:                                                                                                  #  POINT1        FACTOR TO REDUCE UPCONTROL GAIN                         .1
035646,000300:                                                                                                  #  Q2            FINAL PHASE RANGE - 23500 Q3                            -1002   NM
035647,000301:                                                                                                  #  Q3            FINAL PHASE DRANGE/D V                                  .07     NM/FPS
035648,000302:                                                                                                  #  Q5            FINAL PHASE DRANGE/D GAMMA                              7050    NM/RAD
035649,000303:                                                                                                  #  Q6            FINAL PHASE INITIAL FLIGHT PATH ANGLE                   .0349   RAD
035650,000304:                                                                                                  #  Q7F           MIN DRAG FOR UPCONTROL                                  6       FPSS
035651,000305:                                                                                                  #  Q7MIN         MIN VALUE FOR Q7 IN FACTOR CALCULATION                  40      FPSS
035652,000306:                                                                                                  #  Q19           FACTOR IN GAMMAL1 CALCULATION                           .5
035653,000307:                                                                                                  #  Q21           FACTOR IN Q2 CALCULATION.                               1000    NM
035654,000308:                                                                                                  #  Q22           FACTOR IN Q2 CALCULATION.                               -1302   NM
035655,000309:                                                                                                  #  VFINAL1       VELOCITY TO START FINAL PHASE ON INITIAL ENTRY          27000   FPS
035656,000310:                                                                                                  #  VFINAL        FACTOR IN INITIAL UP-DOWN CALC                          26600   FPS
035657,000311:                                                                                                  #  VLMIN         MINIMUM VL                                              18000   FPS
035658,000312:                                                                                                  #  VMIN          VELOCITY TO SWITCH TO RELATIVE VEL                      VSAT/2
035659,000313:                                                                                                  #  VRCONTRL      RDOT TO START INTO HUNTEST                              700     FPS
035660,000314:                                                                                                  #                VRCONT=COMPUTER NAME
035661,000315:                                                                                                  #  25NM          TOLERANCE TO STOP RANGE ITERATION                       25      NM
035662,000316:                                                                                                  #  VQUIT         VELOCITY TO STOP STEERING                               1000    FPS
035663,000317: 

Page 796

035665,000319:                                                                                                  #  CONVERSION FACTORS AND SCALING CONSTANTS
035666,000320:                                                                                                  #  ---------- ------- --- ------- ---------
035667,000321: 
035668,000322:                                                                                                  #  ATK   ANGLE IN RAD TO NM                                              3437.7468       NM/RAD
035669,000323:                                                                                                  #  GS    NOMINAL G VALUE FOR SCALING                                     32.2            FPSS
035670,000324:                                                                                                  #  HS    ATMOSPHERE SCALE HEIGHT                                         28500           FT
035671,000325:                                                                                                  #  J     GRAVITY HARMONIC COEFFICIENT                                    .00162346       
035672,000326:                                                                                                  #  KWE   EQUATORIAL EARTH RATE                                           1546.70168      FPS
035673,000327:                                                                                                  #  MUE   EARTH GRAVITATIONAL CONSTANT                                    3.986032233 E14 CUBIC M/ SEC SEC
035674,000328:                                                                                                  #  RE    EARTH RADIUS                                                    21202900        FT
035675,000329:                                                                                                  #  REQ   EARTH EQUATORIAL RADIUS                                         20925738.2      FT
035676,000330:                                                                                                  #  VSAT  SATELLITE VELOCITY AT RE                                        25766.1973      FPS
035677,000331:                                                                                                  #  WIE   EARTH RATE                                                      .0000729211505  RAD/SEC
035678,000332: 
035679,000333:                                                                                                  #                (END GSOP AS-278, VOL 1, FIG. 5.6-3 CONSTANTS, GAINS, ETC.)
035680,000334: 
035681,000335:                                                                                                  #  DISPLAY QUANTITIES
035682,000336:                                                                                                  #  ------------------
035683,000337: 
035684,000338:                                                                                                  #  (SEE SECTION 4 OF THE GSOP FOR SIGN CONVENTIONS.)
035685,000339: 
035686,000340:                                                                                                  #  VARIABLE      DESCRIPTION                             MAXIMUM VALUE
035687,000341:                                                                                                  #  --------      -----------                             ------- -----
035688,000342: 
035689,000343:                                                                                                  #  QMAX          PREDICTED MAXIMUM ENTRY ACCEL           163.84 GS       N 60
035690,000344:                                                                                                  #  VPRED         PREDICTED VELOCITY AT ALTITUDE          128 M/CENTISEC  N 60
035691,000345:                                                                                                  #                400K FT ABOVE FISCHER RADIUS.
035692,000346:                                                                                                  #  GAMMAEI       PREDICTED GAMMA AT ALTITUDE             1 REVOLUTION    N 60
035693,000347:                                                                                                  #                400K FT ABOVE FISCHER RADIUS.
035694,000348:                                                                                                  #  D             DRAG ACCELERATION                       805 FPSS        N 64
035695,000349:                                                                                                  #  VMAGI         INERTIAL VELOCITY MAGNITUDE             128 M/CENTISEC  N 64, N 68
035696,000350:                                                                                                  #  THETAH        DESIRED RANGE ANGLE NM                  1 REVOLUTION    N 64, N 67
035697,000351:                                                                                                  #  LAT           PRESENT LATITUDE                        1 REVOLUTION    N 67
035698,000352:                                                                                                  #  LONG          PRESENT LONGITUDE                       1 REVOLUTION    N 67
035699,000353:                                                                                                  #  RTOGO         RANGE ANGLE TO SPLASH FROM              1 REVOLUTION    N 63
035700,000354:                                                                                                  #                EMSALT FT ABOVE FISCHER RADIUS. (IN NM) 
035701,000355:                                                                                                  #  VIO           PREDICTED VELOCITY AT ALTITUDE          128 M/CENTISEC  N 63
035702,000356:                                                                                                  #                EMSALT FT ABOVE FISCHER RADIUS.
035703,000357:                                                                                                  #  TTE           TIME OF FREE FALL TO ALT                B 28 CENTISEC   N 63
035704,000358:                                                                                                  #                EMSALT FT ABOVE FISCHER RADIUS.
035705,000359:                                                                                                  #  ROLLC         ROLL COMMAND                            1 REVOLUTION    N 66, N 68, N 69
035706,000360:                                                                                                  #  LATANG        CROSS-RANGE ERROR (XRNGERR)             4 RADIANS       N 66
035707,000361:                                                                                                  #  DNRNGERR      DOWN RANGE ERROR                        1 REVOLUTION    N 66
035708,000362:                                                                                                  #                (PREDANG - THETAH IN NM)
035709,000363:                                                                                                  #  HDOT          ALTITUDE RATE                           128 M/CENTISEC  N 68
035710,000364:                                                                                                  #  Q7            MINIMUM DRAG FOR UPCONTROL              805 FPSS        N 69
035711,000365:                                                                                                  #  VL            EXIT VELOCITY FOR UP-CONTROL            2 VSAT          N 69
035712,000366: 

Page 797

035714,000368:                                                                                                  #  BODY ATTITUDE QUANTITIES  (CM/POSE)
035715,000369:                                                                                                  #  -----------------------------------
035716,000370: 
035717,000371:                                                                                                  #  VARIABLE      DESCRIPTION                             MAXIMUM VALUE
035718,000372:                                                                                                  #  --------      -----------                             ------- -----
035719,000373:                                                                                                  #   -
035720,000374:                                                                                                  #  -VREL         NEGATIVE VELOCITY REL TO ATMOS.         2 VSAT
035721,000375:                                                                                                  #  -
035722,000376:                                                                                                  #  OLDUYA        USED FOR UYA BELOW 1000 FPS             2
035723,000377:                                                                                                  #  -
035724,000378:                                                                                                  #  UXA/2         UNIT VECTOR TRIAD                       2
035725,000379:                                                                                                  #  -
035726,000380:                                                                                                  #  UYA/2                 BASED ON                        2
035727,000381:                                                                                                  #  -
035728,000382:                                                                                                  #  UZA/2                         THE TRAJECTORY.         2
035729,000383:                                                                                                  #  -
035730,000384:                                                                                                  #  UBX/2         UNIT VECTOR                             2
035731,000385:                                                                                                  #  -
035732,000386:                                                                                                  #  UBY/2                 BODY TRIAD                      2
035733,000387:                                                                                                  #  -
035734,000388:                                                                                                  #  UBZ/2                         FOR CM.                 2
035735,000389: 

End of include-file ENTRY_LEXICON.agc.  Parent file is MAIN.agc