Portal:Astronomy/Events/September 2021
< Portal:Astronomy | Events
| 6 September, 00:28 | Mercury at aphelion |
| 7 September, 00:52 | New moon |
| 8 September, 20:18 | Conjunction of the Moon and Mercury |
| 9 September, 00:17 | Moon at perihelion |
| 10 September, 02:08 | Conjunction of the Moon and Venus |
| 10 September | Comet 4P/Faye at perihelion |
| 11 September, 10:03 | Moon at perigee |
| 11 September, 19:10 | Asteroid 2 Pallas at opposition |
| 14 September, 03:55 | Mercury at greatest eastern elongation |
| 14 September, 08:12 | Neptune at opposition |
| 17 September, 02:33 | Conjunction of the Moon and Saturn |
| 18 September, 06:54 | Conjunction of the Moon and Jupiter |
| 18 September, 16:44 | Moon at aphelion |
| 20 September, 11:33 | Mars at apogee |
| 20 September, 23:54 | Full moon |
| 22 September, 19:14 | Earth southward equinox |
| 26 September, 21:43 | Moon at apogee |