| 1944-46 | Chairman of the Astronomical Commission of the USSR Academy of Sciences |
| 1947-72 | Member of the Committee on Lenin and USSR State prizes in the field of science and engineering |
| 1947-96 | Chairman of the Administrative Board of the "Knowledge" society of the Armenian SSR |
| 1952-64 | Chairman of the Commission on Cosmogony of the USSR Acad. Sci. |
| 1955 | Member of the Council on the coordination of works of Academies of Sciences of the Union Republics |
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| 1955-88 | Member of the Presidium of the USSR Academy of Sciences |
| 1956 | Member of the Committee on Lenin prizes |
| 1966 | Member of the Executive Committee of the International Council of Scientific Unions (ICSU) |
| 1970- | Chairman of the Committee of the Armenian SSR State prizes in the field of science and engineering |
| 1974-87 | Chairman of the United Scientific Council on Astronomy of the USSR Academy of Sciences |
| 1977-96 | Chairman of the Specialized Council for Theses Defense at BAO |
| 1987 | Councilor of the Armenian Philosophical Academy |
| 1994-96 | Councilor of the Russian Academy of Sciences |
