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- International Astronomical Union (60)
- International Astronomical Union. Symposium (49)
- United States. National Aeronautics and Space Administration (33)
- International Astronomical Union. Colloquium (31)
- Hellwege, K. H. (20)
- Hellwege, A. M. (19)
- NATO Advanced Study Institute (18)
- COSPAR (15)
- United States Naval Observatory. Nautical Almanac Office (14)
- Society of Photo-optical Instrumentation Engineers (13)
- COSPAR. Plenary Meeting (11)
- International Astronomical Union. General Assembly (10)
- Rycroft, Michael J. (9)
- American Mathematical Society (8)
- Beer, Arthur, 1900- (8)
- European Southern Observatory (8)
- Jeffreys, Harold, Sir, 1891- (8)
- Kopal, Zdeněk, 1914- (8)
- Lunar Science Conference (8)
- Luyten, Willem Jacob, 1899- (8)
- McCormac, Billy Murray (8)
- Moore, Patrick, 1923- (8)
- Advanced Course of Swiss Society of Astronomy and Astrophysics (7)
- American Geophysical Union (7)
- Centre national de la recherche scientifique (France) (7)
- Great Britain. Nautical Almanac Office (7)
- Hermann, Robert, 1931- (7)
- Hoyle, Fred, Sir, 1915-2001 (7)
- Lunar Science Institute (7)
- Runcorn, S. K. (7)
- Schweizerische Gesellschaft für Astrophysik und Astronomie (7)
- American Physical Society (6)
- Basov, N. G. (Nikolaĭ Gennadievich), 1922- (6)
- Collatz, L. (Lothar), 1910- (6)
- ESLAB Symposium (6)
- Einstein, Albert, 1879-1955 (6)
- Gehrels, Tom, 1925- (6)
- Kaufmann, William J., 1942- (6)
- Kukarkin, B. V. (6)
- Melchior, Paul J. (6)
- National Science Foundation (U.S.) (6)
- Newton, Robert R. (6)
- Optical Society of America (6)
- Pies, Wolfgang (6)
- Schopper, Herwig F. (6)
- Thirring, Walter E., 1927- (6)
- Weiss, Alarich (6)
- 萩原, 雄祐(1897-1979) (6)
- American Astronomical Society (5)
- Copernicus Symposium (5)
- Copernicus, Nicolaus, 1473-1543 (5)
- Gingerich, Owen, 1930- (5)
- Hilbert, David, 1862-1943 (5)
- Holovna astronomichna observatorii︠a︡ (Akademii︠a︡ nauk Ukraïnsʹkoï RSR) (5)
- Horowitz, Richard (5)
- Institute of Electrical and Electronics Engineers (5)
- International School of Physics "Enrico Fermi" (5)
- International Union of Theoretical and Applied Mechanics (5)
- Kitt Peak National Observatory (5)
- Manned Spacecraft Center (U.S.) (5)
- North Atlantic Treaty Organization. Scientific Affairs Division (5)
- Philip, A. G. Davis (5)
- Ruffini, Remo (5)
- Smithsonian Astrophysical Observatory (5)
- Szebehely, Victor G., 1921- (5)
- Temam, Roger (5)
- United States. National Aeronautics and Space Administration. Scientific and Technical Information Office (5)
- 東京大学海洋研究所 (5)
- Akademii︠a︡ nauk SSSR. Astronomicheskiĭ sovet (4)
- Alfvén, Hannes, 1908- (4)
- Ames Research Center (4)
- Box, George E. P., 1919- (4)
- Brandt, John C. (4)
- Burgess, Eric (4)
- Cesari, Lamberto (4)
- Cook, Alan H. (4)
- Doetsch, Gustav, 1892- (4)
- Donnelly, Richard Frank (4)
- Fischer, Hanns (4)
- Françon, M. (Maurice), 1913- (4)
- Giacconi, Riccardo (4)
- Goddard Space Flight Center (4)
- Gott, Preston F. (4)
- Herrmann, Dieter B. (4)
- International Astronomical Union. Commission 34 (4)
- International Conference on Cosmic Rays (4)
- International Union of Geodesy and Geophysics (4)
- Jager, C. de (Cornelis de), 1921- (4)
- Lakshmikantham, V., 1926- (4)
- Lanzerotti, Louis J. (4)
- Lie, Sophus, 1842-1899 (4)
- Longair, M. S., 1941- (4)
- Lyndon B. Johnson Space Center (4)
- Marsden, Jerrold E., 1942- (4)
- Matthews, Mildred Shapley (4)
- Mitton, Simon, 1946- (4)
- Motz, Lloyd, 1910- (4)
- National Radio Astronomy Observatory (U.S.) (4)
- Needham, Joseph (Noel Joseph Terence Montgomery), 1900-1995 (4)
- North Atlantic Treaty Organization (4)