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A table listing some of the Astronomical Phenomena for September 2017:

Phenomena September

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