The only way to really know your Sun Sign is to create a birth chart. You can find any number of websites offering free birth charts - both western and Indian.
I must add that both the Western and Indian systems are correct - within their own knowledge domain.
yes, I am a Jyotishi but do not believe in predictions, therefore no way to make money out professional consultations
I believe, Astrology is a great tool for Personal Growth. And in fact, Personal Growth is the only purpose of Astrology.
rest later,
Jyotishi