Chronological list of V.A. Ambartsumian's dates of life


Years   Events
     
1908   Ambartsumian was born on September 18 in Tiflis (Tbilisi)
1919   Read first books on astronomy and began taking interest in astronomy
1920-1923   Public lectures in Tbilisi on various topics of astronomy
1920   First 3 scientific works on nebulae, planetary systems and double stars, cosmogony, and Sun-spots (unpublished manuscripts)
1924   Visit to Yerevan; public lectures on Einstein's theory of relativity
1924   Public lecture in Tbilisi on Einstein's theory of relativity
1924   Finishing of the secondary school in Tbilisi
1924-1925   Student of the physical-mathematical department of the Leningrad (St. Petersburg) A.I. Gertsen Pedagogical Institute
1926-1928   Student of the Physical-Mathematical Department of the Leningrad (St. Petersburg) University
1926   First scientific publications (on the Solar physics; together with N.A. Kosirev; in German journals "Astronomische Nachrichten" and "Zeitschrift für Physik")
1927   First papers on the radiative equilibrium in outer and inner layers of stars (together with N.A. Kosirev; in MNRAS)
1927-1928   Observing practice at Pulkovo Observatory; A.A. Belopolski becomes Ambartsumian's supervisor
1928   Graduated from the Physical-Mathematical Department of the Leningrad University, specialization "astronomy" (together with N.A. Kosirev, Eropkin, Khramov, Druri)
1928-1931   Post-graduate studies at the Pulkovo Observatory (supervisor: A.A. Belopolski)
1929   Publication of results on a Problem of the Theory of Eigenvalues (in "Zeitschrift für Physik"), where for the first time a problem inverse to Sturm-Liuville's problem was formulated
1929   Visit to Armenia (together with his friends N.A. Kozirev, I. Kibel, and M.P. Bronstein)
1929   Participation in the conference on Quantum physics (Kharkov); talk on the quantization of the space
1930   An idea that not only the quanta of the electromagnetic field, photons, but also other particles (including particles having nonzero rest mass) may be born and disappear as a result of their ineraction with other particles (this idea lays in the basis of modern physics of the elementary particles and quantum field theory) (together with D.D. Ivanenko, in "Doklady Aced. Nauk SSSR")
1930   Suggestion that the atomic nuclei do not contain electrons and beside protons must contain neutral particles (together with D.D. Ivanenko; publications in "Doklady Aced. Nauk SSSR" and "Compte rendu hebd. Séances Acad. Sci. Paris")
1931-1935   Pulkovo Observatory research associate
1931-1932   Scientific Secretary of the Pulkovo Observatory 
1931-1934   Lecturer (Associate Professor) of Astrophysics at the Leningrad State University (courses of Astrophysics, Theoretical Astrophysics, and Theoretical Physics)
1931   Married Vera Feodorvna Klochikhina
1932   Suggestion of a new method for determination of the temperature of the planetary nebulae nuclei (paper on "The Radiative Equilibrium of a Planetary Nebulae" in MNRAS)
1933-1934   Head of the Division of Astrophysics of the LSU Astronomical Observatory
1933   Determination of masses of the envelopes thrown out by Novae stars (together with N.A. Kosirev; in "Zeitschrift für Physik")
1934   Professor of the Leningrad State University (LSU)
1934   Foundation of the Chair of Astrophysics at LSU by V.A. Ambartsumian
1934-1946   Head of the first in the Soviet Union Chair of astrophysics at the Leningrad State University 
1934   Participation in the I All-Union Astronomic-Geodesic Congress (Moscow, January); talk "Inner Structure and Evolution of Stars"
1935   Scientific degree of Doctor of physical-mathematical sciences (without defense of thesis)
1936   Derivation of the Space Velocities Distribution Function of the Stars from the Observed Radial Velocities (in MNRAS)
1936   Existence of the great number of white dwarf stars in the Galaxy was proven (together with G.A. Shain; in "Astronomisheski Zhournal")
1936   Visit to Abastumani Astrophysical Observatory for collaboration with Georgian astronomers; lectures
1936-1937   Based on the statistics of double stars, the incorrectness of the generally accepted estimate of the age of our Galaxy obtained by prominent English scientist James Jeans (so-called "long scale") was shown and a new estimate of its age was given (10 billion years as an upper limit, so-called "short scale"); in a discussion started in "Nature" (England) and "Astronomicheski Zhournal" (USSR)
1937   Visit to Abastumani Astrophysical Observatory for collaboration with Georgian astronomers (Gordeladze, et al.); lectures
1937-1944   Scientific Head of the Yerevan Astronomical Observatory
1938   Principles of the statistical mechanics of stellar systems; it was proven that open star clusters disintegrate during about 1 billion years (in "Uch. Zap. LGU")
1938   The nature and the clumpy structure of the Galactic absorbing matter was proven (together with Sh.G. Gordeladze; "Bulletin Abastumani Obs.")
1939   Corresponding member of the USSR Academy of Sciences
1939   Visit to Abastumani Astrophysical Observatory for consultations; lectures and seminars
1939   Publication of the first in the Soviet Union and the first Russian textbook "Theoretical Astrophysics"
1939-1941   Director of the Astronomical Observatory of the Leningrad State University 
1940   Member of the Communist Party of the Soviet Union (CPSU)
1940   Title of Honorary Scientist of the Armenian SSR
1941   Visit to Tbilisi for participation in opening of the Georgian Academy of Sciences
1941-1943   Pro-Rector of the Leningrad State University on scientific affairs
1941-1943   Head of the Scientific-Research branch of the University, evacuated to Elabuga (Tatar ASSR)
1941   Moving with family and colleagues from Leningrad to Elabuga (Tatarian ASSR)
1941-1942   Development of the principle of invariance, a new theory of light scattering in turbid medium (in "Journal of Physics" and "Izv. Acad Sci. USSR")
1943   Foundation of the Armenian Academy of Sciences (in the absence of Ambartsumian)
1943   Full member (also Founding member) of the Armenian SSR Academy of Sciences  
1943-1947   First Vice-President of the Armenian SSR Academy of Sciences 
1943   Visit to Yerevan for celebration of foundation of the Armenian Academy of Sciences
1944   Visit to Moscow for consultations with the Presidium of the USSR Academy of Sciences
1944   The principles of the theory of fluctuations (in "Doklady Acad. Sci. USSR")
1944   Moving with family from Elabuga (Tatarian ASSR) to Yerevan
1944   First visit to Byurakan for study of the site and the astroclimate
1944   Labour Red Banner Order for outstanding services in preparing astronomy specialists and on the occasion of 125th anniversary of the Leningrad University
1944   Foundation of the Chair of Astrophysics at YSU by V.A. Ambartsumian
1944-1994   Head of the newly created Chair of Astrophysics at the Yerevan State University 
1944-1946   Director of the Yerevan Astrophysical Observatory of the Armenian SSR Academy of Sciences
1944-1946   Chairman of the Astronomical Commission of the USSR Academy of Sciences 
1944-1959   Editor-in-Chief of the journal "Doklady Arm. SSR Acad. Sci." ("Reports of the Armenian SSR Academy of Sciences")
1944-1979   Member of the Editorial Board of the "Astronomicheski Zhournal" of the USSR Acad. Sci. ("Soviet Astronomy", later "Astronomy Reports")
1945   Visit to Moscow for celebration of the 220th anniversary of the USSR Acad. Sci.
1945   Lenin Order for outstanding services in development of science and engineering and on occasion of the 220th anniversary of the USSR Acad. Sci.
1946   First foreign trip; Paris (one night) and London for celebrations devoted to the 300th anniversary of Isaac Newton. Visit to Cambridge; meeting Paul Dirac and Spenser Jones. Return through Berlin; visiting Zeiss factory for the 1m Schmidt telescope
1946   Member of the International Astronomical Union (IAU)
1946   USSR (Stalin) State prize for creation of the new theory of light scattering in turbid medium
1946   Foundation of the Byurakan Astrophysical Observatory (BAO) by V.A. Ambartsumian
1946-1988   Director of the newly founded Byurakan Astrophysical Observatory (BAO) of the Arm. SSR Acad. Sci.
1946   Foundation of the journal "Communications of the Byurakan Observatory" by V.A. Ambartsumian
1946-1985   Editor-in-Chief of the "Communications of the Byurakan Observatory"
1947   Discovery of the stellar associations, stellar systems of a new type, and hypothesis on the group origin of stars (in the talk "Evolution of Stars and Astrophysics" at the Jubilee session of the Arm. SSR Acad. Sci.)
1947   Honorary member of the American Astronomical Society (AAS)
1947   Professor of the Yerevan State University (YSU)
1947-1951   Deputy of the Armenian SSR Supreme Soviet
1947-1993   President of the Armenian SSR Academy of Sciences 
1947-1956   Chairman of the Editorial-Publishing Council of the Armenian SSR Academy of Sciences
1947-1972   Member of the Committee on Lenin and USSR State prizes in the field of science and engineering at the USSR Council of Ministers
1947-1996   Chairman of the Administrative Board of the "Knowledge" society of the Armenian SSR
1948-   Member of the Central Committee of the Communist Party of the Armenian SSR
1948   Participation in the IAU GA VII (Zurich, Switzerland, 11-18 Aug); talk "On the Patchy Structure of the Interstellar Absorbing Layer"
1948-1955   Vice-President of the International Astronomical Union (IAU)
1949   Visit to Abastumani; lecture on Stellar Associations
1949-1953   Chairman of the Armenian Republican Committee of supporters of peace 
1949   Head of the Armenian delegation at the All-union conference of supporters of peace in Moscow
1949   Prediction of the phenomenon of expansion of the stellar associations (in "Astronomicheski Zhournal")
1950   USSR (Stalin) State prize for the discovery and study of new type of stellar systems, "stellar associations" (together with B.E. Markarian)
1950   Head of the Soviet delegation at the international conference on Astronomical Constants in Paris
1950   Visit to Berlin for participation in the celebrations of the 250th anniversary of the German Acad. Sci. in Berlin
1950   Participation in the session of the IAU Executive Committee in Stockholm
1950   Finishing of the construction of Ambartsumian's house in Byurakan and moving there
1950-1989   Deputy of the USSR Supreme Soviet of III, IV, V, VI, VII, VIII, IX, X, and XI convocations
1951   Participation in the First Conference on Problems of Cosmogony (Moscow, 16-19 Apr)
1951   Statistics of the Trapezium type systems and a proof of disintegration of the young stellar systems (in "Doklady Arm. SSR Acad. Sci.")
1951   Participation in the session of the IAU Executive Committee in Paris
1951   First conference in Byurakan: "Stellar Associations and the Distribution of Hot Giants" (12-16 Nov)
1952   Participation in the Peoples Congress for defense of peace in Vienna
1952   Delegate of the CPSU XIX congress
1952   Head of the Soviet delegation at the IAU GA VIII (Rome, Italy, 4-13 Sep); Introductory talk at the sympoisum on evolution of stars
1952-1964   Chairman of the Commission on Cosmogony of the USSR Acad. Sci.
1952   Participation in the Second Conference on Problems of Cosmogony (Moscow, 19-22 May); talk "On the Origin and Development of Stars and Stellar Systems"
1952   Participation in the 10th All-Union astronomical conference (Pulkovo, Leningrad); talk "Problems of Astronomical Study of the Stellar Associations"
1952   Publication of the textbook "Theoretical Astrophysics" (co-authors: E.R. Mustel, A.B. Severnyi, V.V. Sobolev)
1953   Head of the Soviet delegation at the International astronomical conference (later named as IAU Symp. #1) on "Coordination of Studies on the Galactic Structure (Groningen, The Netherlands, 17-22 June)
1953   Head of the Soviet delegation at the International astronomical conference on the Fundamental Problems of the Stellar Classification (Paris, France, 29 June - 3 July)
1953   Labour Red Banner Order for long service and stainless work
1953   Participation in the Third Conference on Problems of Cosmogony (Moscow, 14-15 May); Summary Talk 
1953   Full member of the USSR Academy of Sciences
1953   Honorary member of the Royal Astronomical Society (Great Britain)
1953   Participation in the V Liege international astrophysical symposium: "Dust in the Astronomical Objects"; talk "On the Origin of Stars"
1953   Corresponding member of the Royal Society (Academy of sciences) of Belgium (Liege)
1953   Member of the Astronomical Society of the Pacific (ASP)
1954   Head of the Soviet delegation at the VI Liege international astrophysical symposium: "Solid Particles in Cosmic Objects"; talk "On Comet-like Nebulae"
1954   On the invitation of the London University Council, gave a few lectures on stellar dynamics. Gave astrophysical colloquiua at the Universities of Manchester, Edinburgh, and Saint-Andrews
1954   Showed the nonthermal nature of the continuous emission observed in the spectra of non-stable stars and put forward a hypothesis about new possible sources of stellar energy ("The Continuous Emission and Sources of Stellar Energy", in "Commun. BAO")
1954   Participation in the Fourth Conference on Problems of Cosmogony (Moscow, 26-29 Oct); Introductory talk and Concluding Remarks, talk "On the Nature of T Tauri Stars"
1955   Participation in the II Congress of the All-Union Astronomic-Geodesic Society ("VAGO", Moscow); talk "Problems of Modern Astrophysics"
1955   Mission to the GDR (Berlin, Dresden, Jena) in the parliamentary delegation of the USSR Supreme Soviet
1955   Participation in the World Assembly of supporters of peace in Helsinki
1955-1988   Member of the Presidium of the USSR Acad. Sci.
1955   IAU Symp. #3: "Non-Stable Stars", Dublin, Ireland, Sep 1 (not attended personally), at the IAU GA IX (Dublin, Ireland, 29 Aug - 5 Sep); talk "Stars of T Tauri and UV Ceti types and the Phenomenon of Continuous Emission" (presented by A.G. Masevich)
1955   IAU Symp. #5: "The Large-Scale Structure of the Galactic System", Dublin, Ireland, Sep 2 (not attended personally), at the IAU GA IX (Dublin, Ireland, 29 Aug - 5 Sep); talk "Some Remarks on Multiple Galaxies" (presented by A.G. Masevich)
1955   Member of the Council on the coordination of works of Academies of Sciences of the Union Republics
1955   Participation in the Fifth Conference on Problems of Cosmogony (Moscow, 9-12 Mar); talk "On the Nature of Radio Sources", the new physical interpretation of radiogalaxies
1956   First ideas concerning the hypothesis on activity of the galactic nuclei
1956   Corresponding member of the Academy of Sciences of Austria
1956   Janssen Medal of the French Astronomical Society for scientific services
1956   Delegate of the CPSU XX congress
1956   Official inauguration of the Byurakan Observatory. Symposium: "Non-Stable Stars" (Byurakan, 20-22 Sep); several talks. In one of them for the first time cosidered inverse Compton-effect as a possible mechanism of radiation of non-stable stars
1956   Member of the Committee on Lenin prizes
1956   Visit to the USA (Palomar, Lick, and other observatories); seminars
1957   On the invitation of the Austrian Academy of Sciences participated in the annual meeting of the Academy. Gave several lectures at the universities of Vienna, Innsbruk, and Graz, as well as at the Vienna Observatory
1957   Participation in the Sixth Conference on Problems of Cosmogony (Moscow, 5-7 June); talk "On some Data of Extragalactic Astronomy"
1957   Head of the Soviet delegation at the III Symposium on Cosmic Gas Dynamics (Cambridge, USA); talk "To the Problem of the Mechanism of the Origin of Stars in Stellar Associations"; visiting the largest American observatories: Mt. Palomar, Mt. Wilson, and Lick, where gave several lectures 
1957   Corresponding member of the German Academy of Sciences in Berlin
1957   Foreign honorary member of the American Academy of Arts and Sciences (Boston)
1958   Participation in the XI Solvay conference on Problems of Large Universe (Bruxelles, Belgium); talk: "On the Evolution of Galaxies"; gives evidences supporting for the first time put forward by him understanding on the cosmogonic activity of the galactic nulcei
1958   Participation in the All-Union Conference on the Theory of Probability and Mathematical Statistics (Yerevan); Introductory Talk and talk: "On the Fluctuations in the Apparent Distribution of Stars"
1958   Participation in the All-Union Conference on the Philosophical Problems of the Natural Science (Moscow); talk: "Some Methodological Questions of Cosmogony"
1958-1974   Corresponding member of the Academy of Sciences of France  
1958   Chairman of the Organizing Commmittee and Head of the Soviet delegation at the IAU GA X (Moscow, 12-20 Aug)
1958   Lenin Order for outstanding services in the field of development of astronomy and on the occasion of his 50th anniversary
1958   Ambartsumian's 50th anniversary: publication of the book "Viktor Amazaspovich Ambartsumian" (bibliographic reference book, comp. by E.S. Vlasyan and S.S. Yazichyan, Yerevan, Arm. SSR Acad. Sci., 121p.)
1959   Member of the USA National Academy of Sciences
1959   Foreign member of the German Academy of Naturalists ("Leopoldina") in Halle (GDR)
1959   Honorary member of the Royal Astronomical Society of Canada 
1959   Participation as a member of the delegation of the USSR Acad. Sci. in the National Science Congress of India in Delhi
1960   Catherine Bruce gold medal of the Astronomical Society of the Pacific (California, USA) for outstanding services in the field of astronomy
1960   Gold medal of the Great Britain Royal Astronomical Society for works in the field of theoretical astrophysics and stellar astronomy. On the occasion of the official award of the medal Ambartsumian gave a George-Darwin lecture at the session of the Society in London "Evolution of Stellar Systems"
1960   Medal "For Labour Valour"
1960-1961   Development of the theory of superdense degenerate stellar configurations (together with G.S. Sahakyan, 3 papers in "Astronomicheski Zhournal")
1960   Installation of the 1m Schmidt telescope in Byurakan
1960   Publication of the 1st and 2nd volume of Ambartsumian's collection of papers (ed. V.V. Sobolev)
1961   Participation in the IAU Symp. #15: "Problems of Extragalactic Research" (Santa-Barbara, CA, USA, 10-12 Aug); talk "Multicolour Photography of Galaxies at the Crimean Observatory"
1961   Head of the Soviet delegation at the IAU GA XI (Berkeley, CA, USA, 15-24 Aug). Invited Discourse: "Problems of Extra-Galactic Research"
1961-1964   President of the International Astronomical Union (IAU) 
1961   Delegate of the CPSU XXII congress
1961   N.S. Khrushchev's visit to Byurakan (together with Ya.N. Zarobyan, et al.)
1962   Visit to Bucarest (Romania) for discussions and collaboration
1962   Chairman of the IAU Executive Council Meeting in Yerevan
1963   Head of the Soviet delegation at the IAU Symp. #20: "The Galaxy and the Magellanic Clouds" (Canberra, Australia, 18-28 Mar); talk: "Superassociations in Distant Galaxies"; in Australia also gave public lectures
1963   Title of Honorary Doctor (honoris causa) of the Australian National University (Canberra)
1963   On the way back from Australia visited Indonesia (Bandung), where participated in the symposium "Standards for Stellar Photometry and Spectral Classification"; Address from the IAU President
1963   Visit to the USA (Washington, Boston, Pasadena) for celebrations, devoted to the 100th anniversary of the USA National Acad. Sci.; Address from the IAU President
1963   Participation in the session of the ICSU Executive Committee in Prague as the IAU President
1964   Head of the Soviet delegation at the IAU GA XII (Hamburg, FRG, 25 Aug - 3 Sep); talk at Joint Discussion on radiogalaxies "Some Remarks on the Nature of the Nuclei of Galaxies"
1964   First All-Union Conference on the Problem of Extraterrestrial Civilizations (Byurakan, 20-23 May); Introductory talk
1964   Participation in the XIII Solvay conference on Problems of Structure and Evolution of Galaxies (Bruxelles, Belgium); Introductory talk: "On the Nuclei of Galaxies and Their Activity"
1965   Foundation of the All-Union journal "Astrofizika" by V.A. Ambartsumian (published in Yerevan and translated into English as "Astrophysics")
1965-1987   Editor-in-Chief of the newly founded journal "Astrofizika" ("Astrophysics")
1965   Title of Honorary Doctor (honoris causa) of the Paris (Sorbonne) University as a recognition of services to world science. Several lectures during his visit to Paris
1965   On the invitation of the Hungarian Acad. Sci. visited Hungary (Budapest). Several lectures at the Acad. Sci. and the Budapest Astronomical Observatory
1965   Participation in the Second Soviet Gravitational conference: "Problems of Gravitation" (Tbilisi, 20-28 Apr); talk: "The Nuclei of Galaxies and Their Activity"
1965   Participation in the IV Congress of the All-Union Astronomic-Geodesic Society ("VAGO", Riga, Oct); talk: "Perspectives of Development of Modern Astrophysics"
1965-1974   Chairman of the Editorial Board of the first "Armenian Soviet Encyclopedia"
1965-1987   Chairman of the Scientific-Publishing Council of the first "Armenian Soviet Encyclopedia"
1966   IAU Symp. #29: "Non-Stable Phenomena in Galaxies" (Byurakan, USSR, 4-12 May); Introductory talk: "Non-Stable Phenomena in Galaxies"; Chairman of SOC
1966   Delegate of the CPSU XXIII congress
1966   Head of the Soviet delegation at the session of the ICSU Executive Council (Bombay, India)
1966   Member of the Executive Committee of the International Council of Scientific Unions (ICSU)
1967   Title of Honorary Doctor (honoris causa) of the Liege University (Belgium)
1967   Head of the Soviet delegation at the IAU GA XIII (Prague, Czechoslovakia, 22-31 Aug)
1967   Title of Honorary Doctor (honoris causa) of the Carlov (Praha) University (Czechoslovakia). Lecture during the award ceremony at the IAU General Assembly in Prague
1967   Head of the Soviet delegation at the session of the ICSU Executive Committee in Rome
1967   Member of the Italian National Academy of Sciences "Dei Lincei"
1968   Visit to Hungaria (Budapest) as the head of the Arm. SSR Acad. Sci. for signing contract of scientific collaboration between the Hungarian and Armenian academies of sciences
1968   Participation in the XIV International Philosophic Congress (Vienna, Austria); talk "Contemporary Natural Science and Philosophy"
1968   Participation in the ICSU General Assembly (Paris, France); elected ICSU President
1968-1970   President of the International Council of Scientific Unions (ICSU) (first term)
1968   Ambartsumian's 60th anniversary: International Symposium "Stars, Nebulae, Galaxies" in Byurakan (16-19 Sep); publication of the book "Viktor Ambartsumian" by L.V. Mirzoyan (Yerevan, "Giteliq", 1968, 61p., in Armenian)
1968   Prediction of the total number of flare stars in a cluster based on the number of the observed flares (talk presented at the Symposium in Byurakan "Stars, Nebulae, Galaxies": "On the Statistics of Flare Objects")
1968   Title of the Hero of Socialist Labour with investiture of Lenin Order and Gold medal "Hammer and Sickle" for great services in the development of astronomical science and on the occasion of his 60th anniversary 
1968   Title of Honorary Scientist of the Georgian SSR 
1968   Publication of the book "Problems of Evolution of the Universe" in Armenian and Russian
1969   Cyril & Mefodiy Order of I degree by Presidium of the National Assembly of the People's Republic of Bulgaria for successes in development of science
1969   Honorary member of the London Royal Society (Great Britain Academy of Sciences)
1969   Honorary member of the Cambridge Philosophical Society (England)
1969   On the invitation of the German Acad. Sci. in Berlin visited GDR (Berlin and Potsdam) as the Head of the delegation of the Arm. SSR Acad. Sci.; talk at the Academy: "On the Development of Science in Soviet Armenia"
1969   Honorary member of the Society of Theoretical and Applied Mechanics of Poland
1969   Visit to Italy: Padua, Armenian Island St. Lazar near Venice
1970   S.I. Vavilov medal by the Presidium of Administration of the All-Union Society "Knowledge" for services in popularization of political and scientific knowledge
1970   Participation in the symposium "The Nuclei of Galaxies" (Rome, Italy); Introductory talk
1970   Head of the Soviet delegation at the IAU GA XIV (Brighton, UK, 18-27 Aug); visit to Jodrell Bank
1970   Member of the Royal Netherlands Academy of Sciences
1970   Participation in the ICSU General Assembly (Madrid, Spain); Summary Report on the ICSU activities; elected ICSU President for the second term
1970-1972   President of the International Council of Scientific Unions (ICSU) (second term)
1970   Gold medal of the Slovak Academy of Sciences for outstanding scientific and social activity and for services to humanity
1970   Participation in the II All-Union conference on Philosophical Problems of the Natural Science (Moscow); talks "Problems of Methodology of the Natural-Science Search" (together with V.V. Kazyutinski) and "Materialistic Dialectics - Methodology and Logic of the Developments of Modern Natural Science"
1970-   Chairman of the Committee of the Armenian SSR State prizes in the field of science and engineering at the Armenian SSR Council of Ministers
1971   Delegate of the CPSU XXIV congress
1971   On the invitation of the USA Congress visited USA (Washington) as the ICSU President; participated in the session of the Commission of Science and Astronautics of the Congress at the discussion of the problem of the development of science; talk: "New Mechanisms of the Future Collaboration"; visited the Green Bank Radioastronomical Observatory 
1971   The first Soviet ultraviolet space observatory "Orion-1" (designed and built in Byurakan by G.A. Gurzadyan, et al.) operated onboard Soviet spacecraft
1971   Member of the Royal Academy of Sciences of Denmark 
1971   Founding member and member of the Council of the USSR Philosophical Society
1971   Helmholtz medal by the German Academy of Sciences in Berlin (GDR) for successes in the field of natural sciences 
1971   M.V. Lomonosov Gold medal, the highest award of the USSR Acad. Sci., by the Presidium of the Academy for outstanding achievements in the field of astronomy and astrophysics; Lomonosov talk at the award ceremony: "Non-Stationary Phenomena in the World of Stars and Galaxies"
1971   First international (Soviet-American) symposium on "The Problem of Extraterrestrial Civilizations and Communication with them" (Byurakan, 6-11 Sep); Introductory talk
1971   Participation in the IAU Col. #15: "New Directions and New Frontiers in Variable Star Research" (Bamberg, FRG, 31 Aug - 3 Sep); talk: "Flare Stars" (together with L.V. Mirzoyan)
1972   On the invitation of the University of Cologne visited FRG (Cologne, Bonn, Munich, Heidelberg) as the head of the delegation of the Armenian SSR Acad. Sci.; several talks about the activities of the Byurakan Astrophysical Observatory 
1972   Participation in the ICSU General Assembly (Helsinki, Finland); Summary Report on the ICSU activities
1972   Honorary member of the Azerbaijan SSR Acad. Sci.
1972   Title of Honorary Doctor (honoris causa) of the Warsaw University (Poland)
1972   In honour to V.A. Ambartsumian, the asteroid #1905 was named "Ambartsumian" (discovered by T.M. Smirnova in Crimea on 14 May 1972)
1973   Honorary member of the Royal Academy of Sciences of Sweden
1973   Head of the Soviet delegation at the IAU Extraordinary GA (Torun, Warsaw, Krakov; Poland, 4 Sep), devoted to the 500th anniversary of Copernicus
1973   The second Soviet ultraviolet space observatory "Orion-2" (designed and built in Byurakan by G.A. Gurzadyan, et al.) operated onboard Soviet spacecraft
1973   Order of "Service" of the III degree by the Government of Poland for outstanding scientific services 
1973   Title of Honorary Doctor (honoris causa) of the Nicolaus Copernicus Torun University (Poland)
1973   Participation in the General Meeting of the USSR Acad. Sci., devoted to the 500th anniversary of Copernicus; talk "Copernicus and Modern Astronomy"
1973   Honorary member of the New-York Academy of Sciences
1974   Foreign member of the Academy of Sciences of Bulgaria 
1974   Participation in the IAU Symp. #67: "Variable Stars and Stellar Evolution" (Moscow, USSR, 29 Jul - 4 Aug); talk: "Flare Stars in Star Clusters and Associations" (together with L.V. Mirzoyan)
1974   Kotenius Gold medal by the German Academy of Naturalists ("Leopoldina") in Halle (GDR)
1974   Visit to Argentina (Buenos-Aires, Cordoba, La-Plata, San-Juan, Rossario); lectures and consultations at the universities and observatories on astrophysics and extragalactic astronomy
1974   Foreign member of the Cordoba (Argentina) Academy of Sciences
1974   Sarmiento medal by the Cordoba (Argentina) Academy of Sciences for scientific and pedagogical services
1974   Title of Honorary Doctor (honoris causa) of the La-Plata University (Argentina)
1974   Lenin Order for scientific services on the occasion of the 250th anniversary of the USSR Acad. Sci.
1974-1987   Chairman of the United Scientific Council on Astronomy of the USSR Acad. Sci.
1974   Talk at the conference devoted to the 100th anniversary of the Tashkent Observatory: "On the Role of the Non-Stationary Processes in the Evolution of Galaxies" (presented by H.M. Tovmassian)
1975   Publication of the book "Viktor Amazasp Ambartsumian" (bibliographic reference book, comp. G.N. Finashina, Moscow, Nauka, 136p.)
1975   Order of "Banner" of the Hungarian People's Republic
1975   Visit to GDR (Berlin and Weimar) for celebrations of the 275th anniversary of the German Acad. Sci. in Berlin; talk: "On the Evolutionary Processes in the Universe"
1975   Participation in the 3rd European Regional IAU Meetings (Tbilisi, USSR, 1-5 July); talks: "The Role of the Nuclear Activity in the Overall Evolutionary Processes in Galaxies" and "Compact Groups of Compact Galaxies"
1975   Participation in the conference on the Problems of Philosophical Struggle in Modern Natural Science (Moscow); talk "Revolution in Modern Astronomy and Problems of Outlook on Life" (together with V.V. Kaziutinski)
1976   Participation in the 2nd Joint Colloquium of the Byurakan and Abastumani (Georgia) astrophysical observatories (Abastumani, May); talk
1976   Delegate of the CPSU XXV congress
1976   Foreign member of the Academy of Sciences of India
1976   Installation of the 2.6m telescope in Byurakan (at that time one of the world largest telescopes)
1976   International Symposium: "Flare Stars" (Byurakan, 5-8 Oct), dedicated to official opening of the 2.6 m telescope; talk "Results of Observations of Flare Stars in Stellar Aggregates" (together with L.V. Mirzoyan)
1976-   Member of the Editorial Board of the "Reports of the USSR Academy of Sciences"
1977-1996   Chairman of the Specialized Council for Theses Defense at BAO
1977   Participation in the IAU Symp. #79: "The Large Scale Structure of the Universe" (Tallinn, Estonia, USSR, 12-16 Sep); talk: "On the Large Scale Distribution of Galaxies"
1978   Participation in the 4th Joint Colloquium of the Byurakan and Abastumani (Georgia) astrophysical observatories (Abastumani, May); talk
1978   Honorary member of the Georgian SSR Academy of Sciences
1978   Participation in the Joint colloquium of the USSR Acad. Sci. Astronomical Council and the Byurakan Astrophysical Observatory on the Non-Stable Stellar Objects (Crimea); talk 
1978   Ambartsumian's 70th anniversary: An All-Union Conference of Young Astrophysicists (Byurakan, 2-5 Oct); Meeting of the Coordination Council of the presidents of academies (Yerevan; A.P. Aleksandrov, N.G. Basov, et al.); publication of the collected review papers book "Modern Problems of Science about the Universe" (comp. and ed. L.V. Mirzoyan); publication of the book "Viktor Ambartsumian" (biography by L.V. Mirzoyan, in Armenian)
1978   Participation in the International Philosophical Symposium in Dusseldorf
1978   Foreign member of the Academy of Sciences of Czechoslovakia
1978   Corresponding member of the International Academy of Astronautics
1978   Foreign member (Associe etranger) of the Academy of Sciences of France
1978   Title of the Hero of Socialist Labour with investiture of Lenin Order and second Gold medal "Hammer and Sickle" for outstanding services in the development of the Soviet science and on the occasion of his 70th anniversary
1978   Plenum of the Astronomical Council of the USSR Acad. Sci. (Byurakan, 1-3 Nov); talk on the Results of scientific research at BAO
1979   Visit to GDR (Berlin, Potsdam, Jena) for participation in the session of the Acad. Sci., devoted to the 100th anniversary of Albert Einstein; talk: "The Role of Einstein Coefficients of Probability of Transition in Astrophysics"
1979   On the invitation of the French Acad. Sci. visited France for receiving the diploma of the member of the French Acad. Sci.
1979   Honorary member of the Academy of Sciences of Hungary
1979   Participation in the symposium on Theoretical and Mathematical Physics (Dubna) devoted to the 70th anniversary of acad. N.N. Bogolyubov; talk "Inverse Problems of Astrophysics"
1979   Symposium of the Multilateral Research Cooperation of the Academies of Sciences of the Socialist Countries on the Problem of "Stellar Physics and Evolution": "Flare Stars, Fuors and Herbig-Haro Objects" (Byurakan, 22-24 May); talk "On the Possible Correlation between the Luminosity and the Frequency of Flares among the Members of a Stellar Aggregate"
1980   Participation in the symposium devoted to the 2000th anniversary of Aristarch from Samos (Samos island, Greece); talk "Using the Chronology of Discoveries for Purposes of Stellar Statistics"
1980   Participation in the IAU Symp. #93: "Fundamental Problems in the Theory of Stellar Evolution" (Kyoto, Japan, 22-25 July); talk "An Observational Approach to the Early Stages of Stellar Evolution" (together with L.V. Mirzoyan)
1980   Participation in the meeting dedicated to 1500th anniversary of Davit the Invincible (Moscow)
1981-1991   Member of the Editorial Board of the international journal “Vistas in Astronomy” (“Astronomy Prospects”, UK)
1981   IV Soviet-Finnish Astronomical Meeting (Conference on Various Problems of Galactic and Extragalactic Astronomy) (Byurakan, 9-14 June); talk "On Origin of the Diffuse Nebulae"
1981-199?   Member of the Editorial Board of the journal "Nauka v SSSR" ("Science in the USSR")
1981   All-Union symposium devoted to the 40th Anniversary of the Introduction of the Principle of Invariance by V.A. Ambartsumian to the Radiation Transfer Theory: "Principle of Invariance and its Applications" (Byurakan, 26-30 Oct); Introductory talk "On Applications of the Principle of Invariance"
1981   Participation in the III All-Union conference on Philosophical Problems of Modern Natural Science (Moscow); talk "Dialectics of Knowledge of the Evolutionary Processes in the Universe" (together with V.V. Kazyutinski)
1981   Participation in the conference devoted to the 100th anniversary of the Astronomical Observatory of the LSU
1982   Participation in the 6th Joint Colloquium of the Byurakan and Abastumani (Georgia) astrophysical observatories (Tbilisi, May); talk; meeting with young scientists of Georgia in Tbilisi
1982   Head of the Soviet delegation at the IAU GA XVIII (Patras, Greece, 17-26 Aug); talk at the guest session of the Working Group "Flare Stars" of the IAU Commission "Variable Stars" in the Stefanian Observatory on the "Byurakan Studies of Flare Stars in Young Stellar Systems"
1982   Honorary citizen of Tbilisi (Georgia)
1982   Participation in the Annual Meeting of the USSR Acad. Sci. (Moscow); talk "On the Origin of the Diffuse Nebulae"
1983   On the invitation of the National Observatory (Tonanzintla) visited Mexico (Tonanzintla and Mexico City, 24-26 Feb) for participation in the symposium "Herbig-Haro Objects, T Tauri Stars and Related Phenomena" to honour Guillermo Haro; Concluding remarks
1983   Foreign member of the Academy of Sciences of Athens (Greece)
1983   On the invitation of the Austrian Acad. Sci. visited Austria (Vienna, Graz); lecture at the Graz University: "Evolutionary Processes in the Universe" 
1983   Ambartsumian's 75th anniversary: Joint Colloquium of the Leningrad State University Chair of Astrophysics, USSR Astronomical Council, and the Byurakan Astrophysical Observatory (Byurakan, 14-16 Oct); publication of the book "Viktor Ambartsumian" by L.V. Mirzoyan (in Russian)
1983   October Revolution Order for scientific services and on the occasion of his 75th anniversary
1983   Visit to France (Paris and Cagor) in frame of the delegation of the USSR Supreme Soviet
1983   Participation in the 3rd Latin-American Regional IAU Meeting (LARIM) (Buenos-Aires, Argentina, 28 Nov - 3 Dec); talk "Understanding on Problems of the Origin of Stars developed in the Byurakan Observatory" (presented by E.S. Parsamian)
1984   Gold medal of the Academy of Sciences of Czechoslovakia for scientific services
1984   Foreign member of the Syrian Scientific Society (Academy of sciences)
1984   Participation in the jubilee conference dedicated to the 50th anniversary of the LSU Chair of Astrophysics (Leningrad); talk
1984   International Symposium: "Flare Stars and Related Objects" (Byurakan, 16-19 Oct)
1984   Participation in the 8th Joint Colloquium of the Byurakan and Abastumani (Georgia) astrophysical observatories (Abastumani, Nov); talk
1985   Honorary member of the Society of History of Science of Syria
1985   Honorary citizen of Yerevan
1986   IAU Symp. #121: "Observational Evidence of Activity in Galaxies" (Byurakan, 3-7 June); Chairman of SOC
1987   Publication of the book "Envoy of the Stars" about Ambartsumian (A. Arzumanyan, Moscow, Progress Publishers)
1987   International School for Young Astronomers, organized jointly by ESO and the Byurakan Observatory: "Observations with Large Telescopes" (Byurakan, 22-28 Sep)
1987   Councilor of the Armenian Philosophical Academy
1988-1990   Chairman of the Editorial Board of the "Armenian Brief Encyclopedia"
1988-1995   Chairman of the Scientific-Publishing Council of the "Armenian Brief Encyclopedia"
1988   Participation in activities of Karabakh movement
1988   Participation in the session of the USSR Supreme Soviet on discussion of the Karabakh problem (Moscow)
1988-1996   Honorary Director of the Byurakan Astrophysical Observatory (BAO) of the Armenian National Acad. Sci.
1988   Ambartsumian's 80th anniversary: All-Union Conference of Young Astrophysicists "Observational Evidences of Instability Phenomena and their Interpretation" (Byurakan, 27-30 Sep); publication of the 3rd volume of V.A. Ambartsumian's collection of papers (comp. E.S. Parsamian, ed. V.V. Sobolev)
1988   Order of "Honour"
1988   State Prize of the Armenian SSR
1988   Visit of acad. G.I. Marchuk (President of the USSR Acad. Sci.) to Armenia
1989-1991   National Deputy of the USSR and member of the USSR Supreme Soviet
1989   IAU Symp. #137: "Flare Stars in Star Clusters, Associations and the Solar Vicinity" (Byurakan, 23-27 Oct); Chairman of SOC
1990   Honorary President of the Armenian Philosophical Society
1990   Hunger strike in Moscow (together with several other people) as a protest for solution of the Karabakh problem
1992   Full member of the European Academy (London)
1992   Full member of the Academy of Creation (Russia)
1993-1996   Honorary President of the Armenian National Academy of Sciences 
1994-1996   Councilor of the Russian Academy of Sciences 
1994   Motherland Order and title of "National Hero of Armenia" for creation of scientific values of international significance, exceptional services in the field of organization of science
1994   George Gamow prize and medal of the Russian Academy of Creation for outstanding contribution in the development of astrophysics
1994   Annual national prize of the All-Armenian Foundation "Hayastan" in the field of science and culture
1994   Honorary member of the Armenian Philosophical Academy
1994   Viktor Ambartsumian Award with medal from Armenian Engineers and Scientists of America (AESA)
1995   State prize of the Russian Federation in the field of science and engineering for the scientific work "Dynamics of the Structure of Stellar Systems"
1996   Member of the Euro-Asian Astronomical Society (EAAS)                
1996   Ambartsumian passed away on August 12 in Byurakan
1998   Ambartsumian's 90th anniversary: IAU Symp. #194: "Activity in Galaxies and Related Phenomena" (Byurakan, 17-21 Aug); the Byurakan Astrophysical Observatory was named after Ambartsumian; opening of V.A. Ambartsumian's house-museum in Byurakan; a street and a secondary school in Yerevan named after Ambartsumian; publication of the book "A Life in Astrophysics" (ed. R.V. Ambartsumian, in English); release of video-film "Viktor Ambartsumian" (in English)
2001   Publication of Ambartsumian's memories book "Episodes of Life" in Russian
2003   Publication of Ambartsumian's memories book "Episodes of Life" in Armenian
2008   Ambartsumian's 100th anniversary: International Conference "Evolution of Cosmic Objects through their Physical Activity" (Byurakan, 15-18 Sep); International Conference “Physics of Compact Objects” (Yerevan State Univ., 17-23 Sep); Meeting dedicated to V.A. Ambartsumian at St Petersburg State Univ.; Second Byurakan International Summer School for Young Astronomers "Practical Astrophysics" (Byurakan, 20-30 Sep); publication of the book with memories about V.A. Ambartsumian (ed. E.S. Parsamian); V.A. Ambartsumian's DVD (compiled by A.M. Mickaelian); anniversary memorial coin and post stamp were produced; V.A. Ambartsumian stipend was established by Russian-Armenian (Slavonic) University (7 Nov); V.A. Ambartsumian prize was established, which will be yearly awarded to the scientists of Russian-Armenian (Slavonic) University for the best scientific work in the field of physics-mathematics and natural sciences
2009   By the Government of Armenia Ambartsumian’s birthday (18 Sep) is declared as the day of astronomy (Jan)
2009   By the decree of the president of Armenia Viktor Ambartsumian International Prize was established, which will be awarded once in two years for outstanding scientific works in astrophysics as well as in related fields of physics and mathematics (17 Apr)
2009   Ambartsumian's statue in Yerevan was opened (15 Dec)
2010   2nd release of V.A. Ambartsumian DVD (compiled by A.M. Mickaelian)