Astronomy: Biographies
- Abbe Georges Lemaitre
- Abu Ishaq Al-Bitruji Al-Ishbili
- Abu Rayhan al- Biruni
- Al-Battani
- Albumazar
- Alvan Clark
- Anders Celsius
- Annie Jump Cannon
- Aristarchus of Samos
- Aristarkh Apollonovich Belopolsky
- Asada Goryu
- Asaph Hall
- Autolycus
- Brahmagupta
- Carl Edward Sagan
- Caroline Lucretia Herschel
- Cassini
- Charles Augustus Young
- Charles Dillon Perrine
- Christoph Scheiner