21.

Comet 1I/`Oumuamua passes perihelion Comet 1I/`Oumuamua makes its closest approach to the Sun. Sat, 09 Sep 2017 (2,430 days ago) in Leo

22.

Close approach of the Moon and Collinder 50 The Moon and Collinder 50 pass close to each other. Tue, 12 Sep 2017 at 04:42 EDT (2,427 days ago) in Taurus

23.

Mercury at greatest elongation west Mercury is bright and well placed in the dawn sky. Tue, 12 Sep 2017 at 05:19 EDT (2,427 days ago) in Leo

24.

Lunar occultation of Aldebaran The Moon will pass in front of Aldebaran (Alpha Tauri), creating a lunar occultation visible from countries and territories including the Contiguous United States, Canada, Mexico and Alaska amongst others. Tue, 12 Sep 2017 at 08:26 EDT (2,427 days ago) in Taurus

25.

Mercury at dichotomy Mercury reaches half phase in the dawn sky. Tue, 12 Sep 2017 at 23:41 EDT (2,427 days ago) in Leo

26.

Moon at Last Quarter The Moon reaches last quarter phase – rising in the east at around midnight and appearing high in the sky by sunrise. Wed, 13 Sep 2017 at 02:25 EDT (2,426 days ago) in Taurus

27.

Mercury at highest altitude in morning sky Mercury is bright and well placed in the dawn sky. Wed, 13 Sep 2017 (2,426 days ago) in Leo

28.

The Moon at perigee The Moon makes its monthly closest approach to the Earth, making it appear fractionally larger than at other times of the month. Wed, 13 Sep 2017 at 12:06 EDT (2,426 days ago) in Taurus

29.

Mercury at perihelion Mercury passes its orbit's closest point to the Sun. Fri, 15 Sep 2017 at 08:33 EDT (2,424 days ago) in Leo

30.

Conjunction of Mercury and Mars Mercury and Mars share the same right ascension, at a separation of 3'22". Sat, 16 Sep 2017 at 14:23 EDT (2,423 days ago) in Leo

31.

Supernova SN2017gxq discovered A new supernova has been discovered in NGC 4964. Sat, 16 Sep 2017 (2,422 days ago)

32.

Close approach of the Moon and Venus The Moon and Venus pass close to each other. Sun, 17 Sep 2017 at 20:39 EDT (2,422 days ago) in Leo

33.

Lunar occultation of Venus The Moon will pass in front of Venus, creating a lunar occultation visible from countries and territories including Australia, Indonesia, New Zealand and Papua New Guinea amongst others. Sun, 17 Sep 2017 at 20:39 EDT (2,422 days ago) in Leo

34.

Conjunction of the Moon and Venus The Moon and Venus share the same right ascension, at a separation of 32'. Sun, 17 Sep 2017 at 20:55 EDT (2,422 days ago) in Leo

35.

Lunar occultation of Regulus The Moon will pass in front of Regulus (Alpha Leonis), creating a lunar occultation visible from countries and territories including Sudan, Libya, Chad and Egypt amongst others. Mon, 18 Sep 2017 at 00:59 EDT (2,421 days ago) in Leo

36.

Conjunction of the Moon and Mars The Moon and Mars share the same right ascension, at a separation of 8'20". Mon, 18 Sep 2017 at 15:42 EDT (2,421 days ago) in Leo

37.

Close approach of the Moon and Mercury The Moon and Mercury pass close to each other. Mon, 18 Sep 2017 at 19:20 EDT (2,421 days ago) in Leo

38.

Lunar occultation of Mercury The Moon will pass in front of Mercury, creating a lunar occultation visible from countries and territories including China, Philippines, Indonesia and Malaysia amongst others. Mon, 18 Sep 2017 at 19:20 EDT (2,421 days ago) in Leo

39.

Conjunction of the Moon and Mercury The Moon and Mercury share the same right ascension, at a separation of 1'46". Mon, 18 Sep 2017 at 19:21 EDT (2,421 days ago) in Leo

40.

New Moon The Moon disappears into the Sun's glare for a few days. Wed, 20 Sep 2017 at 01:31 EDT (2,419 days ago) in Virgo