To Answer this questions you need be expertise in few fields.
Programming, Mathematics, Astrology or Astronomy (Vedic astrology would be better)
I have a personal interest for astrology. Well its my hobby. I have many books and can do some basic calculations. I have a particular interest to Vedic astrology. I can calculate Julian date, houses and Lagna. So on. However Im stuck on calculating planetary rising. Sun, Moon, Venus, mars, Jupiter, Saturn, Uranus, Neptune, Pluto, Rahu, Kethu. I want to develop small application for matchmaking and prediction for my pleasure. (calculate birthchart) Im using old school way of calculating planetary positions using charts and logs.
Does any experts familiar with mathematical formula behind these calculations? Im looking for mathematical formulas to calculate planetary positions/rising.
Java, PHP, VB, code examples even better.