SofaJpl 2 for .NET Framework
IAU SOFA and JPL planetary ephemeris routines, plus a set of classes to support fundamental astronomy programming. Developed and tested under Windows 8.1 and .NET Framework 4.5. Many improvements over the previous SofaJpl release.
Air Navigation Sextants
AFM 51-40 (U.S. Air Force manual "Air Navigation") section pertaining to bubble sextants, from the 1955 and 1960 editions. This is a single 990 k page, of which 95% is graphics. With a slow connection it may be best to turn graphics off and download individual pictures as needed.
Running Fix vs. Estimated Fix
With a simple Monte Carlo simulation program I compare two kinds of navigational fix.
Lunar4 Lunar Distance Navigation Program
A Windows program to determine Greenwich time by the celestial navigation method of lunar distances. It also serves as a geocentric almanac and a sight reduction program.
Lunar 4.4 Celestial Navigation and Almanac Program
Preliminary release of the next Lunar version. The program itself has been extensively tested with excellent results, but the documentation is in a semi-finished state.
Tinyac: A Tiny Almanac Program
A small Windows program for computing the positions of the Sun, Moon, planets, and stars. It will duplicate the precise planetary and stellar reduction examples in The Astronomical Almanac to full accuracy. Does not work under Windows 8. Rewrite pending.
Equinox and Solstice Predictions
Tables of equinox and solstice times for the next 10 years. Discusses the accurate computation of these phenomena.
Lunar Distance Method of Chauvenet
Longitude determination by lunar distance by the "approximative method" of William Chauvenet, implemented in software.

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(last modified 2021-02-20)