If a BTech Mechanical wish to study Astronomy after clearing CSIR NET JRF. Then, in which college should he apply for master-PhD ?

These are list of some top Institutes to study Astronomy

1. Aryabhatta Research Institute of Observational Sciences, Nainital
2. Indian Institute of Astrophysics, Bangalore
3. Indian Institute of Science Education and Research (IISER - all)
4. Indian Institute of Science, (Bangalore)
5. Indian Institute of Space Science and Technology, Thiruvananthapuram
6. Inter-University Centre for Astronomy and Astrophysics, (Pune)
7. National Centre for Radio Astronomy, Pune
8. Physical Research Laboratory, Ahmedabad
9. Radio Astronomy Center, Ooty
10. Raman Research Institute, (Bangalore)
11. Indian Institute of Technology (IIT) Bombay 
12. Indian Centre for Space Physics, Kolkata
13. Savitribai Phule Pune University– Department of Atmospheric and Space Sciences