261.

Asteroid 89 Julia at opposition Asteroid 89 Julia makes closest approach to the Earth. Thu, 07 Sep 2017 at 15:10 EDT (2,448 days ago) in Pegasus

262.

September ε-Perseid meteor shower 2017 The September ε-Perseid meteor shower reaches its peak. Sat, 09 Sep 2017 (2,446 days ago) in Perseus

263.

Comet 1I/`Oumuamua passes perihelion Comet 1I/`Oumuamua makes its closest approach to the Sun. Sat, 09 Sep 2017 (2,446 days ago) in Leo

264.

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 (2,443 days ago) in Taurus

265.

Mercury at greatest elongation west Mercury is bright and well placed in the dawn sky. Tue, 12 Sep 2017 at 05:19 EDT (2,443 days ago) in Leo

266.

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 (2,443 days ago) in Taurus

267.

Mercury at dichotomy Mercury reaches half phase in the dawn sky. Tue, 12 Sep 2017 at 23:41 EDT (2,443 days ago) in Leo

268.

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 (2,442 days ago) in Taurus

269.

Mercury at highest altitude in morning sky Mercury is bright and well placed in the dawn sky. Wed, 13 Sep 2017 (2,442 days ago) in Leo

270.

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 (2,442 days ago) in Taurus

271.

Mercury at perihelion Mercury passes its orbit's closest point to the Sun. Fri, 15 Sep 2017 at 08:33 EDT (2,440 days ago) in Leo

272.

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 (2,439 days ago) in Leo

273.

Supernova SN2017gxq discovered A new supernova has been discovered in NGC 4964. Sat, 16 Sep 2017 (2,438 days ago)

274.

Close approach of the Moon and Venus The Moon and Venus pass close to each other. Sun, 17 Sep 2017 at 20:39 EDT (2,438 days ago) in Leo

275.

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 (2,438 days ago) in Leo

276.

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 (2,438 days ago) in Leo

277.

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 (2,437 days ago) in Leo

278.

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 (2,437 days ago) in Leo

279.

Close approach of the Moon and Mercury The Moon and Mercury pass close to each other. Mon, 18 Sep 2017 at 19:20 EDT (2,437 days ago) in Leo

280.

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 (2,437 days ago) in Leo