Similar to 1981年2月4日の日食
 - AGILEAGILE (satellite)
 - AG星表Astronomische Gesellschaft Katalog▲1 trends
 - AMOS (小惑星)8721 AMOS
 - Am星Am star
 - ANSAstronomical Netherlands Satellite
 - ANS (小惑星)9996 ANS
 - ANTARESANTARES (telescope)
- Ap/Bp星Ap and Bp stars
 - APL (小惑星)132524 APL
 - APM 08279+5255APM 08279+5255
 - ARIEL (宇宙望遠鏡)ARIEL
- Arp 220Arp 220
 - Arp 273Arp 273
 - ASTE望遠鏡Atacama Submillimeter Telescope Experiment
 - ASTRO-GAstro-G
 - AT2018cowSN 2018cow
 - ATLAS彗星Comet ATLAS
 - ATLAS彗星 (P/2019 LD2)P/2019 LD2 (ATLAS)
 - ATLAS彗星 (C/2019 Y4)C/2019 Y4 (ATLAS)
 - AURIGAAURIGA
 - A型主系列星A-type main-sequence star
 - A型小惑星A-type asteroid
 - B2FH論文B2FH paper
 - B612 (小惑星)46610 Bésixdouze
 - B612財団B612 Foundation
 - BAM (小惑星)2031 BAM
 - BATTeRSBATTeRS
 - BD +31°1048HD 37519