Aryabhatiya, a manual of astronomy, is the classic text
composed by Aryabhata. The text is Sanskrit with the commentary Bhatadipika of
Paramadievara. Aryabhatiya in Sanskrit is provided by Sri Sathya Sai Veda
Pratishtan. There is an option to download too but the text is not in pdf
format. You must also not confuse the text to in Hindi pdf.