What is your interest in Indian astronomy? modern or ancient? In ancient astronomy we have texts like suryasiddhanta and many others. The most ancient written text of the world is an Indian text written in Sanskrit and belongs in a time long before the grammarians Panini or Tolkappiyam. But I didn´t have seen this text till now. I will try to find this text when I stay the next time in India.
I am more interested in the ancient Indian astronomy. If you want to this texts, they are very difficult to understand, let us start to discuss them.