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Figure 8.9. Sidereal Hour Angle....................................................................................................... 205
Section 8D Use of the Air Almanac
8.9. Basics ............................................................................................................................. 205
8.10. Finding GHA and Dec.................................................................................................... 205
Figure 8.10. Daily Page From Air Almanac—11 August 1995........................................................... 206
8.11. Finding GHA and Dec of Moon..................................................................................... 207
8.12. Finding GHA and Dec of a Star ..................................................................................... 207
Figure 8.11. Interpolation of Greenwich Hour Angle, Air Almanac.................................................. 208
Figure 8.12. Sidereal Hour Angle Obtained From Table ................................................................... 209
8.13. Summary ........................................................................................................................ 209
Section 8E Celestial Horizon
8.14. Basics ............................................................................................................................. 209
Figure 8.13. Celestial Horizon is 90o From Observer Zenith and Nadir ............................................ 210
Figure 8.14. Parallel Lines Make Equal Angles With Parallel Planes ............................................... 210
Figure 8.15. Parallax.......................................................................................................................... 211
Figure 8.16. The Two Planes Are Parallel.......................................................................................... 211
8.15. Observed Altitude .......................................................................................................... 211
Figure 8.17. Measure Altitude From Celestial Horizon Along Vertical Circle.................................. 212
Figure 8.18. Finding Observed Altitude ............................................................................................. 212
Figure 8.19. Co-Altitude and Zenith Distance.................................................................................... 213
Figure 8.20. Constructing a Circle of Equal Altitude......................................................................... 213
8.16. True Azimuth (Zn) ......................................................................................................... 214
Figure 8.21. Relationship of True Azimuth to an Observer ............................................................... 214
8.17. Celestial Fix ................................................................................................................... 214
Figure 8.22. Celestial Fix With Two Bodies ...................................................................................... 215
Chapter 9—COMPUTING ALTITUDE AND TRUE AZIMUTH
Section 9A Introduction
AFPAM11-216 1 MARCH 2001 11
9.1. Basics ............................................................................................................................. 216
Section 9B LHA and the Astronomical Triangle
9.2. Basics ............................................................................................................................. 216
Figure 9.1. Subpoint of a Star........................................................................................................... 216
9.3. Intercept......................................................................................................................... 217
9.4. Construction of the Astronomical Triangle.................................................................... 217
Figure 9.2. Astronomical Triangle.................................................................................................... 217
Figure 9.3. Celestial—Terrestial Relationship ................................................................................. 218
Figure 9.4. Co-Altitude Equals 90 Minus Hc................................................................................... 219
9.5. Pub. No. 249, Volume 1................................................................................................. 219
Figure 9.5. Enter Tables With LHA Aries and Latitude................................................................... 220
9.6. Postcomputation Method ............................................................................................... 221
9.7. Pub. No. 249, Volumes 2 and 3...................................................................................... 221
9.8. Entering Arguments ....................................................................................................... 222
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