!!Shri!!
I am introducing a new concept of astrology that I have been using for years. It gives the most satisfactory result in the nativity. I also use it for India.
Treat the sun as a moon and true Rahu as the Sun, and then calculate Tithi, Yoga, Karana, and Tara of the Sun. These figures work just like moon-sun Tithi, Yoga, and Tara, and much helpful in deciding good periods for a particular native. I use these figures with Panchang.