Check out these other useful astrology sites (new sites will be added periodically):
https://en.wikipedia.org/wiki/Brihat_Parashara_Hora_Shastra (a Wikipedia article on the ancient source text for Vedic astrology, or “jyotish”)
https://en.wikipedia.org/wiki/Parashara (a Wikipedia article about Parashara, the author of the Brihat Parashara Hora Shastra)
www.LightOnVedicAstrology.com (comprehensive website of my primary jyotish mentor)
http://lightonvedicastrology.com/online-courses (a superbly written and very economical course on Vedic astrology for the beginner and intermediate student. Highly recommended!)
Free Online Version of David Frawley’s “The Astrology of the Seers”: https://archive.org/stream/AstrologyOfTheSeersDavidFrawley/Astrology%20of%20The%20Seers%20%20David%20Frawley_djvu.txt
Free Online Version of Hart De Fouw’s and Robert Svoboda’s “Light on Life”: https://archive.org/details/LightOnLifeAnIntroductionToTheAstrologyOfIndiaHardDeFouwAndRobertSvoboda/page/n49
http://www.astro.com (primarily a site for Western astrology, but can be used for comparison purposes and for generating a free natal Western chart)