á> - 3oO //uh d CODV 2 fí?í FM 6-300 FIELD MANUAL ARMY EPHEMERIS, 1978 HEADQUARTERS, DEPARTMENT OF THE ARMY RETURN TO THE ARMY LIBRARY AUGUST 19 7 7 ROOM 1A518 r.-r!V' WASHINGTON, D.C. 20310 *FM 6-300 Effective 1 January 1978 FIELD MANUAL HEADQUARTERS DEPARTMENT OF THE ARMY No. 6-300 Washington, DC, 29 August 1977 ARMY EPHEMERIS 1978 SECTION I. INTRODUCTION Paragraph Page Purpose and scope 1 1-1 Description of tables and charts 2 1-1 II. ASTRONOMICAL TABLES AND CHARTS Table la. Astronomic refraction correction for temperature (degrees). II-l lb. Astronomic refraction corrected for temperature (mils) II-5 lc. Pressure correction factor CB II-8 2. Sun, 1978 for zero hours universal time (GMT)1 II-9 3. Equation of time graph 11-21 4. Correction to Greenwich mean time interval to obtain Green- wich sidereal time interval 11-22 5a. Conversion of time to arc 11-24 56. Conversion of arc to time 11-25 5c. Conversion of degrees, minutes, and seconds to mils 11-26 6. Convergence 11-27 6a. Grid convergence nomograph 11-38 7. Second term in convergence computation, UTM coordinates 11-39 8a. Second term in convergence computation, geographic coordi- nates (degrees) 11-41 86. Second term in convergence computation, geographic coordi- nates (mils) 11-42 9. Alphabetical star list 11-43 10a. Apparent places of stars, 1978 (degrees) 11-45 106. Apparent places of stars, 1978 (mils of declination) 11-49 11. Apparent places of Polaris, (star no. 10), 1978 11-53 12. To determine azimuth from Polaris, 1978 ’ 11-54 13 Grid azimuth correction, simultaneous observation ^ 11-58 14. Zone to zone azimuth transformation 11-59 ^jrpKTtmanual supersedes FM 6-300, 29 August 1976. For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402 Stock No. 008-020-00672-6 FM 6-300 Section I. INTRODUCTION 1. Purpose and Scope a. This manual is a compilation of tables and charts for Office, Royal Greenwich Observatory, and the Nautical use in computing astronomical azimuths for the field Almanac Office, US Naval Observatory. artillery. These tables and charts are used for computing c. Users of this manual are encouraged to submit azimuth of the sun or selected stars by either the altitude or recommended changes or comments to improve the hour-angle method. A special table (table 12), which is a manual. Comments should be keyed to the specific page, tabular method of computing Polaris, is included for a rapid paragraph, and line of the text in which the change is computation of a Polaris azimuth. The secant tables recommended. Reasons should be provided for each accompanying table 12 are permanent; however, the comment to insure understanding and complete example portion of the explanatory part of the table will be evaluation. Comments should be prepared using DA updated annually. Tables and charts are also included to Form 2028 (Recommended Changes to Publications and correct astronomic azimuth to grid azimuth, to extend Blank Forms) and forwarded direct to the azimuth by simultaneous observation, and to perform zone- Commandant, US Army Field Artillery School, ATT: to-zone transformation of azimuth. ATSF-TD-TM, Fort Sill, Oklahoma 73503. b. Data contained in tables 2, 10a, 106, 1.1, and 12 are 2. Description of Tables and Charts current only for the year in which the manual is effective. These tables are compiled annually by the Counterfire This manual is intended to be used as a companion Department, under the supervision of the NOAA Liaison publication to FM 6-2, Field Artillery Survey. Details on Officer, US Army Field Artillery School. The basic the computation of astronomical azimuth and the use of astronomical data is furnished by H.M. Nautical Almanac these tables and charts are contained in FM 6-2. 1-1 FM 6-300 Section II. ASTRONOMICAL TABLES AND CHARTS TMt ta. Aidronomic Refraction Corrected for Temperature (Degree») TO BE SUBTRACTED FROM OBSERVED ALTITUDE OF SUN OR STAR (Use values of observed altitude and temperature nearest the values tabulated as arguments.) Temperatura *F. ObMrrsd tltitud« -30 - 30 -10 + 10 + 30 +30 +40 +80 +S0 + 70 +80 +00 +100 +110 +120 +130 00 00 40-43 39-45 38-53 38-02 37-15 36-27 35-44 35-01 34-20 33-40 33-01 32-26 31-51 31-36 30-43 30-14 29-46 20 35-57 35-06 34-20 33-35 32-53 32-11 31-33 30-55 30-18 29-44 29-09 28-38 28-07 27-37 27-07 26-42 28-17 40 32-00 31-15 30-34 29-54 29-16 28-39 28-05 27-31 26-59 26-28 25-57 25-30 25-02 24-35 24-09 23-46 23-23 01 00 28-42 28-01 27-25 26-49 26-15 25-42 25-12 24-41 24-12 23-44 23-1* 22-52 22-27 22-03 21-40 21-19 20-59 20 25-55 25-19 24-46 24-13 23-43 23-13 22-45 22-18 21-51 21-26 21-02 20-39 20-17 19-55 19-44 19-15 18-57 40 23-34 23-00 22-31 22-01 21-33 21-06 20-41 20-16 19-52 19-29 19-07 18-46 18-26 18-06 17-47 17-30 17-13 02 00 21-32 21-02 20-35 2907 19-42 19-17 18-54 18-31 18-10 17-49 17-28 17- 16-51 16-33 16-15 16-00 15-45 10 20 19-48 19-20 18-54 18-29 18-06 17-43 17-22 17-01 16-41 16-22 16-03 15-46 15-29 15-12 14-56 14-42 14-28 40 18- 17-51 17-28 17-05 16-43 16-22 16-031 15-43 15-25 15-07 14-50 14-34 14-18 714-02 13-48 13-35 13-22 03 00 16-57 16-33 16-12 15-50 15-30 15-11 14-53 14-35 14-18 14-01 13-45 18- 13-16 13-01 12-48 12-36 12-24 30 20 15-47 15-25 15-05 14-45 14-27 14-08 13-51 13-35 18-19 13-04 12-48 12-35 12-21 12-08 11-55 11-44 11-32 40 14-45 14-25 14-06 13-47 13-30 13-13 12-57 12-42 12-27 12-12 11-58 11-46 11-33 11-20 11-08 10-58 10-47 04 00 13-50 13-31 13-13 12-56 12-40 12-24 12-09 11-54 11-40 11-27 11-14 11-02 10-50 10-38 10-27 10-17 10-07 20 13-01 12-43 12-26 12-10 11-55 11-40 11-26 11-12 10-59 10-46 10-34 10-23 10-11 10-00 09-50 09-40 09-31 40 12-17 12-OQ 11-44 11-29 11-14 11-00 10-47 10-34 10-22 10-10 09-58 09-47 09-37 09-26 09-16 09-08 08-59 05 00 11-38 11-21 11-07 10-52 19-38 10-25 10-13 10-00 09-48 09-37 09-26 09-16 09-06 08-56 08-47 08-38 08-30 20 11-02 10-46 10-32 10-18 1905 09-53 09-41 09-29 09-18 09-07 08-57 08-47 08-38 08-28 08-19 08-12 08-04 40 19- 10-14 10-01 09-48 09-35 09-23 09-122 09-01 08-50 08-40 08-30 08-21 08-12 908-03 07-55 07-47 07-40 06 00 09-59 09-45 09-32 09-20 09-08 08-56 08-46 08-35 08-25 08-16 08-06 07-57 07-49 07-40 07-32 07-25 07-18 20 09-32 09-18 09-06 08-54 08-43 08-32 08-22 08-12 08-02 07-53 07-44 07-35 07-27 07-19 07-11 07-05 06-58 40 09-07 08-54 08-42 08-31 08-20 08-09 08-00 07-50 07-41 07-32 07-23 07-16 07-08 07-00 06-53 06-46 06-40 07 00 08-43 08-31 08-20 08-09 07-59 07-49 07-39 07-30 07-21 07-13 07-05 06-57 06-50 06-42 06-35 06-29 06-23 20 08-22 08-10 08-00 07-49 07-39 07-30 07-21 07-12 07-03 06-55 06-47 06-40 06-33 06-26 06-19 06-13 06-07 40 08-02 07-51 07-41 07-31 07-21 07-12 07- 06-55 06-47 06-39 06-31 06-24 06-17 06-10 06-04 05-58 05-53 03 08 07-44 07-33 07-23 07-13 07-04 06-55 06-47 06-39 06-31 06-24 06-16 06-10 06-03 05-56 05-50 05-45 05-39 26 07-27 07-16 07-07 06-57 06-49 06-40 06-32 06-24 06-17 06-09 06-02 05-56 05-49 05-43 05-37 05-32 05-27 4U 07-11 07-01 06-52 06-42 06-34 06-26 06-18 06-10 06-03 05-56 05-49 05-43 05-37 05-31 05-25 05-20 05-15 09 00 06-56 06-46 06-37 06-28 06-20 06-12 08- 05-58 05-51 05-44 05-37 05-31 05-25 05-19 05-14 05-09 05-04 05 20 06-42 06-32 06-24 06-15 06-08 06-00 05-53 05-46 05-39 05-32 05-26 05-20 05-14 05-08 05-03 04-58 04-54 40 06-29 06-19 06-11 06-03 05-56 05-48 05-41 05-34 05-28 05-21 05-15 05-10 05-04 04-59 04-53 04-49 04-44 10 00 06-16 06-07 0600 05-52 05-44 05-37 05-30 05-24 05-17 05-11 05-05 05-00 04-54 04-49 04-44 04-40 04-35 20 06-05 05-56 05-48 05-41 05-34 05-27 05-20 05-14 05-08 05-02 04-56 04-51 04-45 04-40 04-35 04-31 04-27 40 05-54 05-45 05-38 05-30 05-24 05-17 05-10 05-04 04-58 04-53 04-47 04-42 04-37 04-32 04-27 04-23 04-19 11 00 05-43 05-35 05-28 05-21 05-14 05-07 05-01 04-55 04-50 04-44 04-39 04-34 04-29 04-24 04-19 04-15 04-11 20 05-34 05-26 05-19 05-12 05-05 04-59 04-53 04-47 04-41 03-36 04-31 04-26 04-21 04-16 04-12 04-08 04-04 40 05-24 05-17 05-10 05-03 04-57 04-50 04-45 04-39 04-33 04-28 04-23 04-18 04-14 04-09 04-05 04-01 03-57 12 00 05-15 05-08 95-01 04-55 04-49 04-42 04-37 04-31 04-26 04-21 04-16 04-11 04-07 04-02 03-58 03-54 03-51 20 05-07 05-00 04-53 04-47 04-41 04-35 04-30 04-24 04-19 04-14 04-09 04-05 04-00 03-56 03-52 03-48 03-44 40 04-59 04-52 04-46 04-39 04-34 04-28 04-21 04-17 04-12 04-07 04-03 03-58 03-54 03-50 03-46 03-42 ll-l FM 6-300 Tebla le.