AstralNav
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Computer program for celestial navigation and piloting. Twilight Calculator, Sun/Moon Rise/Set, Star Finder, Sight Reduction and Fix, Noon Sight, Law of Cosines and NASR Methods, Sight Averaging, Arc-Time/LMT-ZT Conversion, and many piloting functions. Celestial Navigation Calculations. An imaginary sphere surrounding the Earth is used for calculations. This is known as the Celestial Sphere. Declination corresponds to Latitude and Hour Angles to Longitudes. Solving a sight uses spherical trigonometry. The triangle is known as the PZX triangle.