A table listing some of the Astronomical Phenomena for September 2018:
| Day (UT) | Time (UT) | Event |
|---|---|---|
| 2 | 08:58 | Venus (mag. -4.6) 1.4 degrees south of Spica (mag. +1.0). |
| 2 | 09:40 | Mercury (mag. -0.9) is at perihelion 0.307 AU (approx. 45.9 million kilometres or 28.5 million miles) from the Sun. |
| 3 | 02:02 | Moon 1.2 degrees north of Aldebaran (mag. +0.9). |
| 3 | 02:38 | Last quarter moon. |
| 5 | 08:10 | Venus (mag. -4.7) at aphelion 0.728 AU (approx. 109 million kilometres or 67.7 million miles) from the Sun. |
| 5 | 22:48 | Mercury (mag. -1.1) 1.0 degrees north of Regulus (mag. +1.4). |
| 6 | 05:28 | Moon 7.8 degrees south of Pollux (mag. +1.1). |
| 6 | 09:53 | Saturn (mag. +0.4) begins direct motion. |
| 7 | 18:27 | Neptune (mag. +7.8) at opposition 28.933 AU (approx. 4,328.3 million kilometres or 2,689.5 million miles) from the Earth. |
| 8 | 01:13 | Moon at perigee approx. 361,354 kilometres or 224,535 miles from the Earth. |
| 9 | 18:02 | New moon. |
| 12 | 03:08 | Moon 7.6 degrees north of Spica (mag. +1.0). |
| 12 | 15:45 | Venus (mag. -4.7) 10.5 degrees south of Moon. |
| 14 | 02:20 | Jupiter (mag. -1.9) 4.4 degrees south of Moon. |
| 15 | 17:13 | Moon 9.0 degrees north of Antares (mag. +1.0). |
| 16 | 12:57 | Mars (mag. -1.7) at perihelion 1.381 AU (approx. 206.6 million kilometres or 128.4 million miles) from the Sun. |
| 16 | 23:16 | First quarter moon. |
| 17 | 10:40 | Vesta (mag. +7.2) 4.8 degrees south of Moon. |
| 17 | 16:30 | Saturn (mag. +0.5) 2.1 degrees south of Moon. |
| 20 | 00:48 | Moon at apogee approx. 404,874 kilometres or 251,577 miles from the Earth. |
| 20 | 06:41 | Mars (mag. -1.6) 4.8 degrees south of Moon. |
| 20 | 07:04 | Mercury reaches superior conjunction. |
| 23 | 01:55 | Equinox. |
| 23 | 15:33 | Neptune (mag. +7.8) 2.4 degrees north of Moon. |
| 25 | 02:53 | Full moon. |
| 27 | 03:51 | Vesta (mag. +7.3) 2.8 degrees south of Saturn (mag. +0.5). |
| 27 | 07:08 | Uranus (mag. +5.7) 4.8 degrees north of Moon. |
| 30 | 07:34 | Moon 1.4 degrees north of Aldebaran (mag. +0.9). |
| 30 | 12:05 | Pluto (mag. +14.3) begins direct motion. |