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Abbot, Charles Greeley

Abell, George Ogden

Abell catalogue

Adams, John Couch

Agrippa (crater)

Aitken, Robert Grant

Alpha Andromedae

Alpha² Canum Venaticorum variable

Amici, Giovanni Battista

Ancient Greeks on the Moon

Andromeda, Constellation

Anthropic principle

Antlia, Constellation

Antoniadi ( crater)

Apollonius (crater)

Apus, Constellation

Aquarius, Constellation

Aquila, Constellation

Ara, Constellation

Aratus (crater)

Aries, Constellation

Astronomische Gesellschaft Katalog

Atmosphere of Jupiter

Atmosphere of Uranus

Auriga, Constellation

Astronomy Encyclopedia

Hellenica World - Scientific Library