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rH >- r- cu n o i () * vO ai rr. i—i n it, H n D H CO CO UJ ml RD Group Report 1964-45 Haystack Pointing System: Moon H. E. Frachtman 10 September Lincoln Laboratory kCHUSET TUTE OF Le ssachus

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Page 1: apps.dtic.mil › sti › pdfs › AD0606154.pdf · 2020-02-12 · I. INTRODUCTION MOONTRACK is a program in the Haystack Univac 490 pointing system whose output is the celestial

rH >- r- cu n o

i () •* vO ai

rr. i—i n it, H

n D H CO CO UJ ml RD

Group Report 1964-45

Haystack Pointing System: Moon

H. E. Frachtman

10 September

Lincoln Laboratory kCHUSET TUTE OF

Le ssachus

Page 2: apps.dtic.mil › sti › pdfs › AD0606154.pdf · 2020-02-12 · I. INTRODUCTION MOONTRACK is a program in the Haystack Univac 490 pointing system whose output is the celestial

The work reported in this document was performed at Lincoln Laboratory, a center for research operated by Massachusetts Institute of Technology, with the support of the U.S. Air Force under Contract AF 19(628)-500.

Page 3: apps.dtic.mil › sti › pdfs › AD0606154.pdf · 2020-02-12 · I. INTRODUCTION MOONTRACK is a program in the Haystack Univac 490 pointing system whose output is the celestial

MASSACHUSETTS INSTITUTE OF TECHNOLOGY

LINCOLN LABORATORY

HAYSTACK POINTING SYSTEM: MOON

H. E. FRACHTMAN

Group 62

GROUP REPORT 1964-45

10 SEPTEMBER 1964

56

LEXINGTON MASSACHUSETTS

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ABSTRACT

This report describes the procedure used by the Haystack pointing computer

program for obtaining the celestial coordinates of the Moon at any time.

Accepted for the Air Force Franklin C. Hudson, Deputy Chief

Air Force Lincoln Laboratory Office

in

Page 5: apps.dtic.mil › sti › pdfs › AD0606154.pdf · 2020-02-12 · I. INTRODUCTION MOONTRACK is a program in the Haystack Univac 490 pointing system whose output is the celestial

I. INTRODUCTION

MOONTRACK is a program in the Haystack Univac 490 pointing system whose

output is the celestial coordinates of the Moon at a given time. The program computes

the coordinates by 4th difference interpolation in the tables of the apparent right

ascension, declination, and radius vector of the Moon published in The American

Ephemeris. The rates of change of the three quantities are computed by numerical

differentiation.

II. INPUTS TO PROGRAM

A. Inputs Furnished by Core Memory

The program uses the registers listed in Table I for input information. The year

and day are used to select the appropriate entries from the ephemeris. The coordin-

ates of the Moon are interpolated for the time which is the sum of the times in CEL-

TIME and DELTATEE.

B. Inputs Furnished by Magnetic Tape

The tape format of the Moon Ephemeris, which has been edited and recorded on

tape by a 7094 program described in Reference (1), is shown in Fig. 1. Each block

of 192 words covers a period of one day. The ephemeris for each day required 8

words for each of 24 hours. The program does not make use of the hour-year-month-

day words in the block. The tape mast be on Unit 1 (normally Servo B) of the Univac

490.

III. PROGRAM OUTPUTS

A. Outputs Left in Core Memory

The apparent celestial coordinates of the Moon, corresponding to the time in

the register CELTIME, together with their numerical derivatives, are stored in

the appropriate registers, as illustrated in Table II.

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Register

W(CELTIME)

W(DELTATEE)

U(YEARMONTH)

L(YEARMONTH)

L(DAY)

W(EQUATOR)

Contents and Scaling

Days B28

Days B28

Year B15 (4 decimal digits)

Month BO

Day of Year BO

Equatorial radius of Earth B17

TABLE I

Core Memory Inputs to MOONTRACK Program

NOTE: Notation "B28" means

that the binary point is to the

right of bit 28.

Page 7: apps.dtic.mil › sti › pdfs › AD0606154.pdf · 2020-02-12 · I. INTRODUCTION MOONTRACK is a program in the Haystack Univac 490 pointing system whose output is the celestial

3-62-3003

14 0

I. D. 13d Conventional Day Number

19 14 8 4 0

All Zero Hour Year Month Day

Right Ascension B26 Radians

First Difference Right Ascension B26 Radians

Declination B26 Radians

First Difference Declination B26 Radians

Radius Vector B22 Earth Equatorial Radii

First Difference Radius Vector B22 Earth Equatorial Radii

Fig. 1. Magnetic Tape Format for Moon Ephemeris

Page 8: apps.dtic.mil › sti › pdfs › AD0606154.pdf · 2020-02-12 · I. INTRODUCTION MOONTRACK is a program in the Haystack Univac 490 pointing system whose output is the celestial

Register

W(RA)

W(DEC)

W(RADIUS)

W(RADOT)

W( DECDOT)

W(RADIUSDOT)

Contents and Scaling

Apparent Right Ascension B27 in revolu- tions

Apparent Declination B27 in revolutions

Distance from center of Earth to center of Moon, B22 Earth Equatorial radii

Numerical Derivative of Right Ascension B37 radians/sec

Numerical Derivative of Declination B37 radians/sec

Numerical Derivative of Radius Vector B24 nautical miles/sec

TABLE II

Core Memory Outputs of MOONTRACK Program

Page 9: apps.dtic.mil › sti › pdfs › AD0606154.pdf · 2020-02-12 · I. INTRODUCTION MOONTRACK is a program in the Haystack Univac 490 pointing system whose output is the celestial

B. Typewriter Outputs

During initialization the MOONTRACK program will type, using the INTERCOM

subroutine, certain information concerning the Moon. Items printed are:

1. Julian Day corresponding to values in YEARMONTH, DAY, and CELTIME

(7 digits).

2. Apparent Right Ascension of the Moon (Hours, Minutes, Seconds to

hundredths).

3. Apparent Declination of the Moon (Degrees, Minutes, Seconds to

hundredths).

4. Day of Year corresponding to values in YEARMONTH and DAY (up to

3 digits).

5. Universal Time for which the coordinates are interpolated. It is the

time in CELTIME at initialization (Hours, Minutes, Seconds to hundredths).

6. The distance between the centers of the Earth and the Moon (Earth's

Equatorial radii to millionths).

7. The words "OBJECT MOON".

If, after a search through 12 files on Unit 1 (or the finding of an end of tape mark),

the moon ephemerides are not found, the program will type "MOON EPHEMERIS FOR

X/Y NOT AMONG FIRST 12 FILES" and will exit to the master control program error

return. "X" and "Y" indicate the current month and year, respectively.

If there is a tape servo malfunction during search, the program will type "IIIC

STATUS SI ZZ" and will exit to the master control program error return. The two

digit octal number "ZZ" comes from the tape status word and indicates the error

condition.

IV. ASTRONOMICAL SIGNIFICANCE

The apparent right ascension and declination of the Moon in the emphemerides

are referred to the true equinox and equator of date and are corrected for planetary

aberration. They are geocentric apparent quantities; the parallax correction is made

by the coordinate conversion program (COCON) in the Haystack system. The values

in the tables are computed for Ephemeris Time as argument. The equation

ET = UT + AT

is used to convert from Universal Time to Ephemeris Time. The constant AT,

represented by the number in the register DELTA TEE is approximately 35 seconds.

Page 10: apps.dtic.mil › sti › pdfs › AD0606154.pdf · 2020-02-12 · I. INTRODUCTION MOONTRACK is a program in the Haystack Univac 490 pointing system whose output is the celestial

The values for the radius vector and first difference of the radius vector which

appear on the ephemeris tape (Figure 1) are computed from the Moon's horizontal

parallax which occurs in the source data. The formula

D = l

sin h

is used by the tape preparation program (Reference 1) to compute the distance D, in

units of Earth's equatorial radii, from the geocentric equatorial horizontal parallax

h. The register EQUATOR contains a number which represents the Earth's equa-

torial radius in nautical miles.

V. PROGRAM DETAILS

The MOONTRACK program is a subroutine of the Haystack Univac 490 pointing

program. The initialization section begins at MOONINIT, the working section at

MOONCONT. There are several closed subroutines within MOONTRACK. These

are: DAYFIND, STATUSCK, INTERPOL, LEFRNDOFF, and MOONTIME. A listing

of the program is given in Appendix I.

A. Initialization

The program, upon initialization, stores an RIL instruction in the tape channel

internal interrupt register and an RJP STATUSCK instruction in the external interrupt

register. The area in core into which the tape data will be read is cleared, together

with some additional registers. This is done to make diagnosis easier in case of

malfunction.

The daily Moon ephemeris entries are serially numbered by the program which

generates the magnetic tape (Reference 1). These serial numbers are called "Con-

ventional Day Numbers" (CDN). An arbitrary decision was made to produce and use

tapes such that the CDN for 25 April 1963 is zero. The tape search process looks

at the first word in each block, therefore, the MOONTRACK, program must compute

the CDN of the block containing the entry for the required hour.

Using as inputs the year, day of year, and the effect of integral and half-integral

values of CELTIME, the program computes the Julian Day number for the typewriter.

The ephemerides start and run continuously from 25 April 1963, which has a Julian

Day Number of 2438144. 5; this number is subtracted from the computed Julian Day

number and appears on tape as the Conventional Day Number. The first CDN in a

block is stored in SAFE and TAPEBLOCK and the Moon identification number is added

to generate a tape search comparison word.

Page 11: apps.dtic.mil › sti › pdfs › AD0606154.pdf · 2020-02-12 · I. INTRODUCTION MOONTRACK is a program in the Haystack Univac 490 pointing system whose output is the celestial

Six blocks of Moon cphemcrides are read to provide sufficient data for 4th

difference Bessel interpolation for a four day period.

If the six block search and read operations are successful control is regained

at NORMAL and the tape is rewound without interrupt or interlock.

The MOONTIME subroutine is entered to select and store the addresses of the

ephemeris entries corresponding to the hour of the day and to compute the interpola-

tion argument P. The register TIME2 contains a number representing the integral

number of hours in the sum of CELTIME and DELTATEE.

Besselian interpolation of right ascension is done by the INTERPOL subroutine

and the interpolated result is converted to hours, minutes, and seconds and stored

for type out. Declination and distance are then interpolated and stored for type out.

The other quantities which are to be typed out by INTERCOM are set up. Control is

transferred to INTERCOM 7 times for the seven line type out, which completes oper-

ation of the initialization section of MOONTRACK.

B. Working Section

The MOONTRACK working section begins at MOONCONT. Control is transferred

to the subroutine MOONTIME which selects the ephemeris entry corresponding to

the current hour, stores the addresses of the table entries, and computes the inter-

polation argument P from the given value of CELTIME. The INTERPOL subroutine

is then entered three times for the interpolation of right ascension, declination, radius

and their time rates. All values are converted, scaled and stored properly in core

memory and control is transferred to the master control program.

C. Subroutines

The initialization section of the MOONTRACK program makes use of the INTERPOL,

DAYFIND, STATUSCK, LEFRND3FF, and MOONTIME subroutines. The working

section uses all except STATUSCK.

1. INTERPOL

The MOONTRACK interpolation subroutine uses Bessel's interpolation formula for

(Reference 3) 4th difference interpolation of the Moon's ephemeris. The formula is

f =f +P6f1/9 + ^5-^ [62f +62f.] p o 1/2 4 o 1

P(P-l)(P-l/2) 3 (P+l)P(P-l)(P-2) 4 4 + g o iy2 t- 4g ^° I0^° V

The quantities in the formula are associated with computer registers as follows:

Page 12: apps.dtic.mil › sti › pdfs › AD0606154.pdf · 2020-02-12 · I. INTRODUCTION MOONTRACK is a program in the Haystack Univac 490 pointing system whose output is the celestial

a. The address of f is in index register 4.

b. The interpolation argument P is in register P.

c. <5fi/9 is in register GAMMA.

d. P(P-l) is in register PSQMP. 2 2

e. 6 f +6 f. is in register DMINB.

f. P(P-l) is in register PSQMP6.

g. 6 f 1/2 is in register DMIN2CPLB.

h. (64f + <54f ) is in register EP2BM2DMA.

i. fp is in the A register at the finish.

The subroutine also performs numerical differentiation using the following formula

(Reference 3):

hf,P = 6h/2+^r: i*\ + 6\*

3P2 - 3P + 1/2 .3. + 6 6 fl/2

At the completion of the subroutine, hf' is stored in the register NUMDERIV.

Wnen the subroutine is entered, Index Register 4 contains the address of f

and the register SETINTAD contains the address of 6f, ,„ of the quantity to be inter-

polated. Index register 3 is used to acquire the other two first difference registers.

2. DAYFIND

The DAYFIND subroutine computes the Julian Day number and CDN correspond-

ing to the current day.

3. STATUSCK

The STATUSCK subroutine is entered from the external interrupt register asso-

ciated with the tape channel when the interrupt occurs. Examination of the status

code generates four possible outcomes:

a. If the code indicates a normal completion, control is returned to

the program at the interrupted point.

b. If the code indicates that an end of tape mark was sensed, the tape

is rewound and a message indicating failure to find the ephemeris is printed by the

typewriter. The message is described in Section III B. Control is passed to the

error return of the master control program.

c. If the code indicates that an end of file mark was sensed, the register

IMPERIAL is indexed and tested for the value 12. When less than 12 an end of tape

condition is assumed and the action is as described in (b) above.

Page 13: apps.dtic.mil › sti › pdfs › AD0606154.pdf · 2020-02-12 · I. INTRODUCTION MOONTRACK is a program in the Haystack Univac 490 pointing system whose output is the celestial

d. If the code indicates anything but end of file, end of tape, or normal

completion, a tape error has occurred. The message described in Section III B,

indicating the type of error, is printed by the typewriter and control is passed to the

error return of the master control program.

4. LEFRNDOFF

The LEFRNDOFF subroutine left shifts the AQ register the number of places

indicated by the contents of index register 5 and rounds the A register.

5. MQQNTIME

The MOONTIME subroutine computes the integral value of the current ephemeris

hour and stores the addresses of the quantities to be interpolated. It computes the

value of the interpolation argument P.

VI. PROGRAM LISTING

The next 23 pages show a APURT output of the MOONTRACK program in 3 parts:

Pp. 10-26

Pp. 27-29

Pp. 30-32

Printout of MOONTRACK program.

Alphabetic list of program symbols.

Numerical list of program symbols.

Page 14: apps.dtic.mil › sti › pdfs › AD0606154.pdf · 2020-02-12 · I. INTRODUCTION MOONTRACK is a program in the Haystack Univac 490 pointing system whose output is the celestial

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Page 15: apps.dtic.mil › sti › pdfs › AD0606154.pdf · 2020-02-12 · I. INTRODUCTION MOONTRACK is a program in the Haystack Univac 490 pointing system whose output is the celestial

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Page 16: apps.dtic.mil › sti › pdfs › AD0606154.pdf · 2020-02-12 · I. INTRODUCTION MOONTRACK is a program in the Haystack Univac 490 pointing system whose output is the celestial

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31

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32

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REFERENCES

1. "Haystack Pointing System Ephemeris Tape Program", M.I. T. Lincoln Laboratory, Publication 1964-41. (In preparation)

2. Explanatory Supplement to the Astronomical Ephemeris and the American Ephemeris and Nautical Almanac (Her Majesty's Stationery Office, London, vmy.

3. R. Butler and E. Kerr, An Introduction to Numerical Methods (Sir Isaac Pitman and Sons, Ltd. , London).

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DISTRIBUTION LIST

W. B. Davenport G. P. Dinneen H. G. Weiss J. W. Meyer

Group 31

J. S. Arthur J. R. Burdette C. A. Clark C. T. Frerichs R. F. Gagne G. M. Hyde R. P. Ingals M. L. Meeks J. E. Morriello V. C. Pineo W. Rutkowski P. B. Sebring M. L. Stone S. Weinreb

Group 62

P. Rosen F. E. Heart W. R. Crowther J. D. Drinan H. E. Frachtman D. M. Hafford A. A. Mathiasen F. Nagy S. B. Russell R. J. Saliga P. D. Smith P. Stylos R. Teoste S. J. White Group 62 Office (5)

Group 76

A. O. Kuhnel

34

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UNCIASSTFTPD Security Classification

DOCUMENT CONTROL DATA - R&D (Security classification ot title, body ot abstract and indexing annotation must be entered when the overall report it c lessitied)

I. ORIGINATING ACTIVITY (Corporate author)

Lincoln Labs., Lexington, Mass.

2a. REPORT SECURITY C L AISI FIC A TION

UNCLASSIFIED 2b GROUP

-H/A- 3 REPORT TITLE

Haystack Pointing Systems Moon

4 DESCRIPTIVE NOTES (Type ot report and inclusive dates)

Group Report 5. AUTHORfSJ (Last name, tint name. Initial)

Frachtman, H.£.

6 REPORT DATE

oep 64

7a- TOTAL NO. OF PASES

J£_ 7b NO. OF REFS

8a. CONTRACT OR GRANT NO.

AF19(628)500 b. PROJECT NO.

d.

9a. ORIGINATOR'S REPORT NUMBERfSJ

GR-1964-45 9b. OTHER REPORT MO(S) (A ny other number* that may be assigned

this report)

ESD-TDR-64-371 10. AVAILABILITY/LIMITATION NOTICES

Qualified Requesters May Obtain Copies Frew. DDC.

11. SUPPLEMENTARY NOTES 12 SPONSORING MILITARY ACTIVITY

ESI), L.G. Hanscor. Field, Bedford, Mass.

13. ABSTRACT

This report describes the procedure used by the Haystack pointing computer program for obtaining the celestial coordinates of the Moon at any time.

DD .5251 1473 Security Classification

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UNCLASSIFIED Security Classification

14. KEY WORDS

LINK A LINK B

ROLE

LINK C

Haystack Moontrack Program Inputs Program Outputs Astronomical Significance

INSTRUCTIONS

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Secunty^JraSSrncation