1908 - Born on September 18th in Georgia and educated at the University of Leningrad, now St. Petersburg State University.
1947-1993 - He was president of Armenian Academy of Sciences.
- He worked at the Pulkovo Observatory, the Byurakan Astrophysical Observatory (BAO), which he founded and directed, Erevan University.
- He was the president of International Astronomical Union.
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