A table listing some of the Astronomical Phenomena for September 2017:
Phenomena September
| Day | Event |
|---|---|
| 2 | Mercury mag. +2.3 passes 4 degrees south of Mars mag. +1.8 (0 UT) |
| 4 | Mercury mag. +1.9 is stationary in Leo, afterwards resumes direct motion (16 UT) |
| 5 | Mars mag. +1.8 passes 0.7 degrees north of Regulus mag. +1.4 (2 UT) |
| 5 | Neptune mag. +7.8 is at opposition in Aquarius approx. 28.939 AU (4,329 million km or 2,690 million miles) from Earth (5 UT) |
| 5 | Jupiter mag. -1.7 passes 3 degrees north of Spica mag. +1.0 (11 UT) |
| 6 | Moon passes 0.8 degrees south of Neptune mag. +7.8 (5 UT) |
| 6 | Full Moon (7:03 UT) |
| 6 | Asteroid (89) Julia mag. +9.0 is at opposition in Pegasus |
| 9 | Moon passes 4 degrees south of Uranus mag. +5.7 (10 UT) |
| 10 | Mercury mag. 0.0 passes 0.6 degrees south of Regulus mag. +1.4 (12 UT) |
| 12 | Mercury mag. -0.4 is at greatest elongation west 17.9 degrees (10 UT) |
| 12 | Moon passes 0.4 degrees north of Aldebaran mag. +0.9, occultation is visible from western USA, Hawaii (12:35 UT) |
| 13 | Last quarter Moon (6:25 UT) |
| 13 | Moon is at perigee 369,855 km or 229,817 miles from Earth (16:05 UT) |
| 15 | Mercury is at perihelion 0.307 AU (approx. 45.9 million kms or 28.5 million miles) from the Sun (13 UT) |
| 15 | Moon passes 9 degrees south of Pollux mag. +1.1 (17 UT) |
| 16 | Mercury mag. -0.8 passes 0.1 degrees north of Mars mag. +1.8 (18 UT) |
| 18 | Moon passes 0.5 degrees south of Venus mag. -3.9, daytime occultation (0:56 UT) |
| 18 | Moon passes 0.1 degrees north of Regulus mag. +1.4, daytime occultation (4:57 UT) |
| 18 | Moon passes 0.1 degrees north of Mars mag. +1.8, daytime occultation (19:43 UT) |
| 18 | Moon passes 0.1 degrees south of Mercury mag. -0.9, daytime occultation (23:22 UT) |
| 19 | Venus passes 0.5 degrees north of Regulus mag. +1.4 (23 UT) |
| 20 | New Moon (5:30 UT) |
| 22 | Moon passes 7 degrees north of Spica mag. +1.0 (2 UT) |
| 22 | Moon passes 4 degrees north of Jupiter mag. -1.7 (8 UT) |
| 22 | Equinox (20:02 UT) |
| 25 | Moon passes 10 degrees north of Antares mag. +1.0 (21 UT) |
| 27 | Moon passes 4 degrees north of Saturn mag. +0.5 (0 UT) |
| 27 | Moon is at apogee 404,341 km or 251,246 miles from Earth (6:51 UT) |
| 28 | First quarter Moon (2:54 UT) |