221.

Mercury at inferior solar conjunction Mercury passes around the near side of the Sun. Wed, 06 Sep 2023 at 07:04 EDT (230 days ago) in Leo

222.

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, 06 Sep 2023 at 18:21 EDT (230 days ago) in Taurus

223.

Lunar occultation of Beta Tauri The Moon will pass in front of Beta Tauri (Elnath) creating a lunar occultation, though it will open be visible only at sea. Thu, 07 Sep 2023 at 11:20 EDT (229 days ago) in Taurus

224.

September ε-Perseid meteor shower 2023 The September ε-Perseid meteor shower reaches its peak. Sat, 09 Sep 2023 (227 days ago) in Perseus

225.

Comet C/2023 P1 (Nishimura) passes perigee Comet C/2023 P1 (Nishimura) makes its closest approach to the Earth. Tue, 12 Sep 2023 (224 days ago) in Leo

226.

The Moon at apogee The Moon recedes to its orbit's furthest point from the Earth, making it appear fractionally smaller than at other times of the month. Tue, 12 Sep 2023 at 11:42 EDT (224 days ago) in Leo

227.

Conjunction of the Moon and Mercury The Moon and Mercury share the same right ascension, at a separation of 5°59'. Wed, 13 Sep 2023 at 13:41 EDT (223 days ago) in Leo

228.

New Moon The Moon disappears into the Sun's glare for a few days. Thu, 14 Sep 2023 at 21:41 EDT (222 days ago) in Leo

229.

Conjunction of the Moon and Mars The Moon and Mars share the same right ascension, at a separation of 39'. Sat, 16 Sep 2023 at 15:20 EDT (220 days ago) in Virgo

230.

Comet C/2023 P1 (Nishimura) passes perihelion Comet C/2023 P1 (Nishimura) makes its closest approach to the Sun. Sun, 17 Sep 2023 (219 days ago) in Virgo

231.

The Moon at perihelion The Moon passes its orbit's closest point to the Sun, which happens each month around the time of new moon. Sun, 17 Sep 2023 at 13:19 EDT (219 days ago) in Virgo

232.

Venus at greatest brightness Venus reaches its greatest brightness in the dawn sky. Mon, 18 Sep 2023 at 08:09 EDT (218 days ago) in Cancer

233.

Neptune at opposition Neptune lies in the opposite direction to the Sun in the sky, making it optimally positioned to be observable for much of the night. Tue, 19 Sep 2023 at 07:09 EDT (217 days ago) in Pisces

234.

Lunar occultation of Antares The Moon will pass in front of Antares (Alpha Scorpii), creating a lunar occultation visible from Japan, Russia, Guam and Northern Mariana Islands. Thu, 21 Sep 2023 at 04:47 EDT (215 days ago) in Scorpius

235.

Mercury at greatest elongation west Mercury is bright and well placed in the dawn sky. Fri, 22 Sep 2023 at 07:27 EDT (214 days ago) in Leo

236.

Mercury at dichotomy Mercury reaches half phase in the dawn sky. Fri, 22 Sep 2023 at 15:26 EDT (214 days ago) in Leo

237.

Moon at First Quarter The Moon reaches first quarter phase – appearing high in the sky at sunset and setting in the west at around midnight. Fri, 22 Sep 2023 at 15:32 EDT (214 days ago) in Sagittarius

238.

September equinox Day and night have equal length, marking the beginning of autumn in the northern hemisphere and spring in the southern hemisphere. Sat, 23 Sep 2023 at 02:46 EDT (213 days ago) in Virgo

239.

Mercury at highest altitude in morning sky Mercury is bright and well placed in the dawn sky. Sat, 23 Sep 2023 (213 days ago) in Leo

240.

Mercury at perihelion Mercury passes its orbit's closest point to the Sun. Sat, 23 Sep 2023 at 14:06 EDT (213 days ago) in Leo