621.

Blue Moon The Moon reaches full phase and is visible for much of the night. Wed, 30 Aug 2023 at 21:35 EDT (385 days ago) in Aquarius

622.

Lunar occultation of Neptune The Moon will pass in front of Neptune creating a lunar occultation, though it will open be visible only at sea. Fri, 01 Sep 2023 at 04:21 EDT (383 days ago) in Pisces

623.

Aurigid meteor shower 2023 The Aurigid meteor shower reaches its peak. Fri, 01 Sep 2023 (383 days ago) in Auriga

624.

Jupiter enters retrograde motion Jupiter reverses its direction of motion across the sky. Mon, 04 Sep 2023 at 10:13 EDT (380 days ago) in Aries

625.

Close approach of the Moon and Jupiter The Moon and Jupiter pass close to each other. Mon, 04 Sep 2023 at 13:37 EDT (380 days ago) in Aries

626.

Conjunction of the Moon and Jupiter The Moon and Jupiter share the same right ascension, at a separation of 3°18'. Mon, 04 Sep 2023 at 15:47 EDT (380 days ago) in Aries

627.

Close approach of the Moon and M45 The Moon and M45 pass close to each other. Tue, 05 Sep 2023 at 16:51 EDT (379 days ago) in Taurus

628.

Mercury at inferior solar conjunction Mercury passes around the near side of the Sun. Wed, 06 Sep 2023 at 07:04 EDT (378 days ago) in Leo

629.

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 (378 days ago) in Taurus

630.

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 (377 days ago) in Taurus

631.

September ε-Perseid meteor shower 2023 The September ε-Perseid meteor shower reaches its peak. Sat, 09 Sep 2023 (375 days ago) in Perseus

632.

Comet C/2023 P1 (Nishimura) passes perigee Comet C/2023 P1 (Nishimura) makes its closest approach to the Earth. Tue, 12 Sep 2023 (372 days ago) in Leo

633.

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 (372 days ago) in Leo

634.

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 (371 days ago) in Leo

635.

New Moon The Moon disappears into the Sun's glare for a few days. Thu, 14 Sep 2023 at 21:41 EDT (370 days ago) in Leo

636.

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 (368 days ago) in Virgo

637.

Comet C/2023 P1 (Nishimura) passes perihelion Comet C/2023 P1 (Nishimura) makes its closest approach to the Sun. Sun, 17 Sep 2023 (367 days ago) in Virgo

638.

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 (367 days ago) in Virgo

639.

Venus at greatest brightness Venus reaches its greatest brightness in the dawn sky. Mon, 18 Sep 2023 at 08:09 EDT (366 days ago) in Cancer

640.

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 (365 days ago) in Pisces