f JO O X& /‘tf! Copy % ra (¡>-3©® tí'tí ☆ Lru SJ é> % <5 & í£ 0 & ^ <n %tí> ^ J> tí ^ ☆ ■u?o íD O tf tí 'u? Ô ☆ ^ * «Cl*0 ☆ o ☆ t> o Û Û ☆ û Cf W ^ ☆ títí <D Ot> O ¿SLb O C3 ^uun.^f IUTHÏ ARMY LIBRARY ROOM 1A513 P^TAG^ HY WASHINGTON, D. C. 2J3J0 1 n *FM 6-300 Effective ! Jamiary 1982 FIEE^ MANUAL HEADQUARTERS DEPARTMENT OF THE ARMY No. 6-3! Washington, DC, 2 October 1981 ARMY EPHEMERIS 1982 Page CHAPTER INTRODUCTION 1-1 CHAPTER 2. ASTRONOMICAL TABLES AND CHARTS 2-1 Table la. Astronomic refractionV corrected for temperature (degrees) 2-1 lb. Astronomic refractio^correctedactio; for temperature (mils) 2-5 lc. Pressure correction factor CB 2-8 2. Sun, 1982, for zero hoursMmiversal time (GMT) 2-9 3. Equation of time graph 2-21 4. Correction to Greenwich meiin time interval to obtain Greenwich sidereal time interval 2-22 5a. Conversion of time to arc 2-24 5b. Conversion of arc to time 2-25 5c. Conversion of degrees, minutes, and seconds to mils 2-26 2-27 6a. Grid convergence nomograph 2-40 7. Second term in convergence computation, ÖTM coordinates 2-41 8a. Second term in convergence computation, geographic coordinates (degrees) .^s. 2-43 8b. Second term in convergence computation, geographic coordinates (mils) 2-44 9. Alphabetical star list „Ä... 2-45 10a. Apparent places of stars, 1982 (degrees) ^ 2-47 106. Apparent places of stars, 1982 (mils of declination) 2-51 11. Apparent places of Polaris (star no. 10), 1982 2-55 12. To determine azimuth from Polaris, 1982 2-56 13. Grid azimuth correction, simultaneous observation 2-61 14. Zone-to-zone azimuth transformation 2-62 *This manual supersedes FM 6-300,28 December 1980. FM 6-300 CHAPTER 1 INTRODUCTION 1-1. Purpose and Scope a. This manualOffice, is Royal a compilation Greenwich of tablesObservatory, and and charts for use in computing astronomical the Nautical Almanac Office, US Naval azimuths for the field artillery. These tables Observatory. and charts are used for computing azimuth of the Sun or selected stars by either the altitude or hour-angle method. A special table (table c. Users of this manual are encouraged to 12), which is a tabular method of computing submit recommended changes or comments Polaris, is included for a rapid computation of to improve the manual. Comments should be a Polaris azimuth. The secant tables keyed to the specific page, paragraph, and accompanying table 12 are permanent; line of the text in which the change is however, the example portion of the recommended. Reasons should be provided explanatory part of the table will be updated for each comment to insure understanding annually. Tables and charts are also included and complete evaluation. Comments should to correct astronomic azimuth to grid be prepared using DA Form 2028 azimuth, to extend azimuth by simultaneous (Recommended Changes to Publications and observation and to perform zone-to-zone Blank Forms) and forwarded direct to the transformation of azimuth. Commandant, US Army Field Artillery School, ATTN: ATSF-TD-TL, Fort Sill, Oklahoma 73503. b. Data contained in tables 2, 10a, 106, 11, and 12 are current only for the year in which 1-2. Description of Tables and Charts the manual is effective. These tables are compiled annually by the Counterfire This manual is intended to be used as a Department, under the supervision of the companion publication to FM 6-2, Field NOAA Liaison Officer, US Army Field Artillery Survey. Details on the computation Artillery School. The basic astronomical data of astronomical azimuth and the use of these is furnished by H.M. Nautical Almanac tables and charts are contained in FM 6-2. 1-1 FM 6-300 CHAPTER 2 ASTRONOMICAL TABLES AND CHARTS Table la. Astronomic Refraction Corrected for Temperature (Degrees) TO BE SUBTRACTED FROM OBSERVED ALTITUDE OF SUN OR STAR (Use values of observed altitude and temperature nearest the values tabulated as arguments.) Temperature F. Observed altitude -30 -20 -10 +10 +20 +30 +40 +50 +60 +70 +80 +90 +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 26-17 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 23-17 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 20-07 19-42 19-17 18-54 18-31 18-10 17-49 17-28 17-10 16-51 16-33 16-15 16-00 15-45 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 17-51 17-28 17-05 16-43 16-22 16-03 15-43 15-25 15-07 14-50 14-34 14-18 14-02 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 13-30 13-16 13-01 12-48 12-36 12-24 20 15-47 15-25 15-05 14-45 14-27 14-08 13-51 13-35 13-19 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 12-00 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 10-38 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 10-05 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 10-29 10-14 10-01 09-48 09-35 09-23 09-12 09-01 08-50 08-40 08-30 08-21 08-12 08-03 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 07-03 06-55 06-47 06-39 06-31 06-24 06-17 06-10 06-04 05-58 05-53 08 00 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 20 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 40 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 06-05 05-58 05-51 05-44 05-37 05-31 05-25 05-19 05-14 05-09 05-04 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 06-00 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 04-36 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 05-01 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 03-39 2-1 FM 6-300 Table 1a.