General views of the Byurakan observatory in Armenia. Starry sky and sun. The Orion Nebula, the Sagittarius Nebula as seen through a telescope. Scientists of the Byurakan Observatory V. A. Ambartsumyan, L. Mirzoyan, V. Markaryan and others are observing the starry sky at telescopes. Moscow city. Meeting room of the 10th International Astronomical Congress in the House of Unions. V. Ambartsumyan is speaking. USA. Convention of the International Astronomical Union, held at the California Observatory in 1961; among the delegates of the congress V. Hambardzumyan. Scientists-astronomers, participants of the session of the Executive Committee of the International Astronomical Union, held in Yerevan in 1962 at the Byurakan observatory; they examine the negatives of the starry sky filming, talk, write formulas on the blackboard. Among those present is a group of British scientists.