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1.13. Local Mean Time (LMT)............................................................................................... 30
Section 1D Relationship of Time and Longitude
1.14. Introduction .................................................................................................................... 30
Figure 1.14. Local Time Differences at Different Longitudes ........................................................... 31
1.15. Standard Time Zone....................................................................................................... 31
1.16. Date Changes at Midnight.............................................................................................. 31
Figure 1.15. Standard Time Zones ..................................................................................................... 32
Figure 1.16. Zone Date Changes ........................................................................................................ 32
1.17. Time Conversion............................................................................................................ 33
1.18. Sidereal Time ................................................................................................................. 33
1.19. Number of Days in a Year.............................................................................................. 33
Figure 1.17. Air Almanac Conversion of Arc to Time....................................................................... 34
Figure 1.18. Greenwich Sidereal Time............................................................................................... 35
1.20. Navigator's Use of Time................................................................................................. 35
Section 1E Charts and Projections
1.21. Basic Information........................................................................................................... 35
Figure 1.19. Developable and Nondevelopable Surfaces................................................................... 36
1.22. Choice of Projection....................................................................................................... 37
Section 1F Classification of Projections
1.23. Introduction .................................................................................................................... 38
1.24. Azimuthal Projections.................................................................................................... 38
Figure 1.20. Azimuthal Projections................................................................................................... 38
Figure 1.21. Polar Gnomonic and Stereographic Projections............................................................. 39
1.25. Cylindrical Projections................................................................................................... 39
Figure 1.22. Cylindrical Projection .................................................................................................... 40
Figure 1.23. Mercator Is Conformal but Not Equal Area................................................................... 41
Figure 1.24. Transverse Cylindrical Projection— Cylinder Tangent at the Poles ............................... 42
Figure 1.25. Transverse Mercator Convergence Graph...................................................................... 43
1.26. Conic Projections ........................................................................................................... 44
Figure 1.26. Simple Conic Projection ................................................................................................ 44
AFPAM11-216 1 MARCH 2001 3
Figure 1.27. Simple Conic Projection of Northern Hemisphere ........................................................ 44
Figure 1.28. Conic Projection Using Secant Cone ............................................................................. 45
Figure 1.29. Lambert Conformal Conic Projection ............................................................................ 45
Figure 1.30. A Lambert Conformal, Convergence Factor 0.78535.................................................... 47
Section 1G Aeronautical Charts
1.27. Basics ............................................................................................................................. 47
1.28. Scale ............................................................................................................................... 48
1.29. DoD Charts and Flight Information Publications .......................................................... 49
1.30. Chart Currency and Updating Information .................................................................... 49
1.31. Chart Symbols................................................................................................................ 49
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