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Way back in the dark ages (1985 or so) there was a book title Astronomy With Your Personal Computer by Peter Duffett-Smith. This book provided BASIC routines for various astonomical calculations: date/time conversions, planetary location, eclipse information, etc. Some of the calculations would be handy for some mobile apps I'm working on, so I decided to look into converting the code to C#.

Just looking at a few lines of the sample programs in the book, it becomes quickly obvious that simply converting the code line-by-line is not a good idea - if nothing else, the precision of the calculations is suspect, and many of the old BASIC commands are just inefficient. Plus, I'm not trying to infringe on any copyrights here!

So, my goal here will be to simply duplicate the purpose of each of the major subroutines in the book in C#. I've listed them below, and as future blog posts are written I'll come back and add the appropriate link.

 Subroutine Description DEFAULT default value input routine No need to convert this one... YESNO 'Y' or 'N' input routine Yeah, skip this one too... MINSEC converts between decimal hours/degrees and minutes/seconds form JULDAY calendar date to Julian day number since 1900 January 0.5 CALDAY Julian day number since 1900 January 0.5 to calendar date TIME converts between local civil and sidereal times EQHOR converts between equatorial and horizon coordinates HRANG converts between right ascension and hour angle OBLIQ calculates the value of the obliquity of the ecliptic NUTAT finds corrections for natation in longitude and obliquity EQECL converts between equatorial and ecliptic coordinates EQGAL converts between equatorial and galactic coordinates GENCON converts between any of the coordinate systems Gotta love that subroutine name! PRCESS1 approximate precession of equatorial coordinates PRCESS2 rigorous precession of equatorial coordinates PARALLX converts between geocentric and apparent position REFRACT calculates the effect of atmospheric refraction RISET finds the circumstances of rising and setting ANOMALY solves Kepler's equation for elliptical motion SUN finds the ecliptic coordinates of the Sun SUNRS finds the circumstances of sunrise and sunset PELMENT returns the orbital elements of the major planets PLANS finds the position of a planet MOON finds the position and parallax of the Moon MOONRS finds the circumstances of moonrise and moonset MOONNF finds the times of new and full moon ECLIPSE finds the circumstances of lunar and solar eclipses DISPLAY displays an eclipse in graphical form ELOSC finds positions from osculating elliptical elements RELEM converts elliptic orbital elements from one epoch to another PCOMET finds the position of a comet from parabolic elements PFIT finds parabolic elements from observations EFIT finds elliptical elements from observations

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