| 1946 | Member of International Astronomical Union (IAU) |
| 1947 | Honorary member of American Astronomical Society (AAS) |
| 1953 | Honorary member of Royal Astronomical Society (UK) |
| 1953 | Member of Astronomical Society of the Pacific (ASP) |
| 1959 | Honorary member of Royal Astronomical Society of Canada |
| 1969 | Honorary member of London Royal Society (UK Academy of Sciences) |
| 1969 | Honorary member of Cambridge Philosophical Society (UK) |
| 1969 | Honorary member of the Society of Theoretical and Applied Mechanics of Poland |
| 1971 | Founding member and member of the Council of the USSR Philosophical Society |
| 1985 | Honorary member of the Society of History of Science of Syria |
| 1996 | Member of Euro-Asian Astronomical Society (EAAS) |
 |
