Astronomy Eligibility

Educational Requirements for Astronomy:
Most astronomy positions require a Ph.D in the field of astronomy, which usually takes 5-7 years to complete. These programs are likely to contain courses in astrophysics, stellar and planetary physics, galaxies, cosmology, interstellar medium and optics. Mathematics and computer science are also emphasized. After completing a Ph.D. programme, aspiring astronomers often enter one or more postdoctoral research positions, which can take roughly 2-3 years to complete. They typically work under senior astronomers before taking on more complex projects. Astronomers who are employed by the federal government may need to obtain the proper security clearance.
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Your son might not be eligible to pursue a Diploma in astronomy right after class 10th. To pursue a Diploma in astronomy, candidates are required to clear class 12th. How to become an Astronomer? To become an Astronomer, a Ph.D. degree is compulsory. First, you have to complete your 10+2 examination under the Science stream, especially in Mathematics and Physics. After that, you can join an undergraduate course in Astronomy. You can join for an honors/major in Physics with Mathematics as a secondary subject. Thereafter, you can join postgraduate degree in Physics or Astronomy. After competing master degree, you can do specialisation in astronomy leading to Ph.D
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They offer an integrated M.Tech + Ph.D program. As mentioned on their website here is the eligibility
'The Integrated M.Tech- Ph.D (Tech.) Programme will admit bright, highly motivated students with a three years B.Tech. degree (Post BSc Hons) in Optics and Optoelectronics / Radio Physics and Electronics from CU or B.Tech / BE degree in Electrical/ Instrumentation/ Electronics and Communications /Computer Science and Engineering from an institution recognized by AICTE. A candidate with M.Sc degree in Physics / Electronic Science / Applied Mathematics /Applied Physics from a UGC recognized institution is also eligible to apply'.
Hence you must hold either of these degrees and pass out with flying colors to be eligible. They will also hold an entrance test. Please check the website of IIAP.