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12.7. Intercept Method ............................................................................................................ 263
12.8. Subpoint Method............................................................................................................ 263
12.9. Eliminating Motions with the Bracket Technique ......................................................... 264
12.10. DR Computer Modification ........................................................................................... 264
Figure 12.8. MB-4 Motions Modification .......................................................................................... 264
Figure 12.9. Celestial Motions – Step One......................................................................................... 265
Figure 12.10. Celestial Motions – Step Two ........................................................................................ 266
Figure 12.11. Celestial Motions – Step Three ...................................................................................... 267
12.11. Combinations of Sun, Moon, and Venus ....................................................................... 267
12.12. Duration of Light............................................................................................................ 268
Section 12D True Heading Celestial Observation
12.13. Basics ............................................................................................................................. 268
12.14. True Bearing (TB) Method ............................................................................................ 268
Figure 12.12. True Bearing Method (Except Polaris) .......................................................................... 269
Figure 12.13. True Bearing Method (Including Polaris) ...................................................................... 270
12.15. Inverse Relative Bearing (IRB) Method ........................................................................ 270
Figure 12.14. Inverse Relative Bearing Method................................................................................... 271
Section 12E Celestial Navigation in High Latitudes
12.16. Basics ............................................................................................................................. 271
12.17. Bodies Available for Observation .................................................................................. 272
12.18. Sight Reduction .............................................................................................................. 272
12.19. Poles as Assumed Positions ........................................................................................... 273
Figure 12.15. Using Pole as Assumed Position.................................................................................... 274
Section 12F Adjusting Assumed Position
12.20. Adjusting Assumed Position for Off-Time Shot............................................................ 274
Figure 12.16. Corrections for Off-Time Shooting................................................................................ 275
12.21. Longitude Adjustment Principle .................................................................................... 275
Figure 12.17. LAP Using Incorrect GHA............................................................................................. 276
Figure 12.18. LAP Using Correct GHA ............................................................................................... 276
Figure 12.19. LAP Correcting a Math Error......................................................................................... 276
12.22. Summary ........................................................................................................................ 277
Chapter 13—SEXTANTS AND ERRORS OF OBSERVATION
Section 13A Sextants
13.1. Introduction .................................................................................................................... 278
13.2. The Bubble Sextant ........................................................................................................ 278
13.3. The Mount...................................................................................................................... 278
Figure 13.1. Body Is Not Sighted Directly......................................................................................... 279
13.4. The Periscopic Sextant ................................................................................................... 279
Figure 13.2. Periscopic Sextant Mount .............................................................................................. 280
14 AFPAM11-216 1 MARCH 2001
Figure 13.3. Correct and Incorrect Collimation.................................................................................. 280
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