501.

Comae Berenicid meteor shower 2023 The Comae Berenicid meteor shower reaches its peak. Sat, 16 Dec 2023 (214 days ago) in Leo

502.

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. Sat, 16 Dec 2023 at 13:52 EDT (214 days ago) in Capricornus

503.

Conjunction of the Moon and Saturn The Moon and Saturn share the same right ascension, at a separation of 2°28'. Sun, 17 Dec 2023 at 17:01 EDT (213 days ago) in Aquarius

504.

Close approach of the Moon and Saturn The Moon and Saturn pass close to each other. Sun, 17 Dec 2023 at 18:44 EDT (213 days ago) in Aquarius

505.

Asteroid 37 Fides at opposition Asteroid 37 Fides makes closest approach to the Earth. Mon, 18 Dec 2023 at 09:22 EDT (212 days ago) in Auriga

506.

Lunar occultation of Neptune The Moon will pass in front of Neptune, creating a lunar occultation visible from Australia. Tue, 19 Dec 2023 at 09:16 EDT (211 days ago) in Pisces

507.

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. Tue, 19 Dec 2023 at 13:39 EDT (211 days ago) in Pisces

508.

December Leonis Minorid meteor shower 2023 The December Leonis Minorid meteor shower reaches its peak. Wed, 20 Dec 2023 (210 days ago) in Leo Minor

509.

Mercury at perihelion Mercury passes its orbit's closest point to the Sun. Wed, 20 Dec 2023 at 12:04 EDT (210 days ago) in Sagittarius

510.

Asteroid 4 Vesta at opposition Asteroid 4 Vesta makes closest approach to the Earth. Thu, 21 Dec 2023 at 16:34 EDT (209 days ago) in Orion

511.

December solstice 22 December will be the shortest day of 2023 in the northern hemisphere. Thu, 21 Dec 2023 at 22:24 EDT (209 days ago) in Sagittarius

512.

Close approach of the Moon and Jupiter The Moon and Jupiter pass close to each other. Fri, 22 Dec 2023 at 07:31 EDT (208 days ago) in Aries

513.

Conjunction of the Moon and Jupiter The Moon and Jupiter share the same right ascension, at a separation of 2°36'. Fri, 22 Dec 2023 at 09:24 EDT (208 days ago) in Aries

514.

Mercury at inferior solar conjunction Mercury passes around the near side of the Sun. Fri, 22 Dec 2023 at 13:50 EDT (208 days ago) in Sagittarius

515.

Asteroid 9 Metis at opposition Asteroid 9 Metis makes closest approach to the Earth. Fri, 22 Dec 2023 at 14:10 EDT (208 days ago) in Gemini

516.

Ursid meteor shower 2023 The Ursid meteor shower reaches its peak. Fri, 22 Dec 2023 (207 days ago) in Ursa Minor

517.

Close approach of the Moon and M45 The Moon and M45 pass close to each other. Sun, 24 Dec 2023 at 03:56 EDT (206 days ago) in Taurus

518.

Comet 62P/Tsuchinshan passes perihelion Comet 62P/Tsuchinshan makes its closest approach to the Sun. Mon, 25 Dec 2023 (205 days ago) in Leo

519.

Lunar occultation of Beta Tauri The Moon will pass in front of Beta Tauri (Elnath), creating a lunar occultation visible from countries and territories including Argentina, Brazil, Uruguay and Falkland Islands amongst others. Mon, 25 Dec 2023 at 21:08 EDT (205 days ago) in Taurus

520.

The Moon at aphelion The Moon recedes to its orbit's furthest point from the Sun, which happens each month around the time of full moon. Tue, 26 Dec 2023 at 14:55 EDT (204 days ago) in Auriga