Hii aspirants 

Let me clear your doubt. Here are list of some top colleges ehich offer courses in astronomy. These are

Indian Institute of Science (IISc) – Bangalore.

IIT Madras

IIT Delhi.

IIT Kanpur. 

Tata Institute of Fundamental Research (TIFR) Mumbai.

Delhi University.

IIT Kharagpur.

Indian Institute of Space Science & Technology (IIST), Trivandrum.

I hope my answer will help you out

Good luck