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• Aarhus University (3)
• AAS (1)
• AAVSO (3)
• AAVSO Headquarters (1)
• Abraham Darby School (1)
• Academic Development Programme, University of Cape Town (1)
• Achva Academic College (1)
• ACU National (1)
• AdC Consulting, Tucson, AZ (1)
• Adler Planearium & Astronomy Museum (1)
• Adler Planetarium (13)
• Adler Planetarium & Astronomy Museum (1)
• ADNAN MENDERES UNIVERSITY INSTITUTE OF SCIENCE AND TECHNOLOGY, (1)
• Adolfo Camarillo High School (2)
• Aix Marseille University, Marseille, France (1)
• Akdeniz University (1)
• Akdeniz University Faculty of Education (1)
• Akita University (2)
• Aksaray University (1)
• Albert-Einstein-Insitut (1)
• Albion College (1)
• Alicante University, Spain (1)
• ALTA Consulting (1)
• American Association of Variable Star Observers (9)
• American Association of Variable Star Observers (AA VSO) (1)
• American Association of Variable Star Observers and Tufts University (1)
• American Astronomical Society (4)
• American Astronomical Society Education Office, University of Chicago (1)
• American Institute of Physics (1)
• American Museum-Hayden Planetarium (3)
• American Museum of Natural History (2)
• American Public University System (2)
• American University (2)
• American University of Beirut (1)
• Amherst College (2)
• Andrew Fraknoi Foothill College (1)
• Andrews University (1)
• Angelo State University (2)
• Anglo-Australian Observatory (1)
• Anne Arundel Community College (5)
• Anre Technologies Inc., (1)
• Appalachian State University (3)
• Arcadia University (1)
• Arcadia University and Upper Dublin School District (1)
• Arcadia University (PA) (3)
• Arcadia University, Pennsylvania (2)
• Area de Astronomia, DIFUS, Universidad de Sonora (1)
• Arecibo Observatory (1)
• Aristotelian University of Thessaloniki (1)
• Aristotle University of Thessaloniki (3)
• Arizona-Sonora Desert Museum (1)
• Arizona State University (4)
• Armagh Observatory, Northern Ireland (1)
• Army and Navy Academy (1)
• Arnim D. Hummel Planetarium (1)
• Arsakeio High School (3)
• Asociacion Sigma Octantis (1)
• Associaci´on Larense de Astronom´ıa (1)
• Association Fran¸caise d’Astronomie (1)
• Association Francaise d’Astronomie (1)
• Association Observation radio - Pleumeur-Bodou (1)
• Association of Science-Technology Centers (1)
• Astley House (1)
• AstoPIX (1)
• Astrometrica, Linz, Austria (1)
• Astronomers without Borders (1)
• Astronomers Without Borders (4)
• Astronomical Institute “Anton Pannekoek”, University of Amsterdam (1)
• Astronomical Institute of the Romanian Academy (4)
• Astronomical Observatory of Capodimonte (1)
• Astronomical Research Institute (1)
• Astronomical Society (NASO) (1)
• Astronomical Society of the Pacific (26)
• Astronomy Department, University of Leicester (3)
• Astronomy Division and Bosscha Observatory, Institut Teknologi Bandung (1)
• Astronomy Education Consultants (1)
• Astronomy Society of the Pacific (1)
• Astrophysics and Cosmology Research Group, TU (1)
• Astrophysics, Cosmology and Gravity Centre (ACGC), University of Cape Town (1)
• Astrophysics Research Institute (1)
• Astrophysics Research Institute, Liverpool John Moores University (2)
• Astrophysics Research Institute/LJMU (1)
• Astrophysics Science Division, NASA Goddard Space Flight Center, (1)
• Atascadero High School (1)
• Atelier f¨ur audiovisuelle Medien PartG (1)
• Atmospheric, Oceanic and Planetary Physics, University of Oxford (1)
• Auckland Observatory (1)
• Auckland Observatory Education Committee (1)
• Auckland University of Technology (1)
• Audience Viewpoints (1)
• Augsburg College (1)
• AUI/NRAO (1)
• Aula EspaZio Gela—UPV/EHU (1)
• Australian Astronomical Observatory (1)
• Australian National University (1)
• Australia Telescope National Facility (3)
• Australia Telescope National Facility, CSIRO (1)
• AutoScope Corporation (1)
• Azerbaijan National Academy of Sciences (1)