Portal:Astronomy/Events/September 2015
| 1 September | Neptune at opposition |
| 1 September, 15:58 | Moon occults Uranus |
| 4 September, 01:00 | Comet SOHO at maximum brightness |
| 4 September, 10:18 | Mercury at greatest eastern elongation |
| 13 September, 06:54 | New moon and partial solar eclipse |
| 14 September, 11:42 | Moon at apogee |
| 23 September, 08:21 | Earth southward equinox |
| 28 September, 01:52 | Moon at perigee |
| 28 September, 02:47 | Full moon and total lunar eclipse |
| 30 September, 14:36 | Mercury at inferior conjunction |