1. Individual member, International Astronomical Union (IAU).

2. Life member, Astronomical Society of India.

3. Life member of Indian Mathematical Society, India.

4. Life member of Ramanujan Mathematical Society, India.

5. Life member of Indian Science Congress Association, India.

6. Life member of American Mathematical Society (AMS).

7. Life member of International Association of Engineers (IAENG).

8. Life member and Hon. Director of Center for Fundamental Research in Celestial Mechanics and Space Dynamics, Delhi.

9. Life member of János Bolyai Mathematical Society, Hungary.