421.

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 (190 days ago) in Aries

422.

Mercury at inferior solar conjunction Mercury passes around the near side of the Sun. Fri, 22 Dec 2023 at 13:50 EDT (190 days ago) in Sagittarius

423.

Asteroid 9 Metis at opposition Asteroid 9 Metis makes closest approach to the Earth. Fri, 22 Dec 2023 at 14:10 EDT (190 days ago) in Gemini

424.

Ursid meteor shower 2023 The Ursid meteor shower reaches its peak. Fri, 22 Dec 2023 (189 days ago) in Ursa Minor

425.

Close approach of the Moon and M45 The Moon and M45 pass close to each other. Sun, 24 Dec 2023 at 03:56 EDT (188 days ago) in Taurus

426.

Comet 62P/Tsuchinshan passes perihelion Comet 62P/Tsuchinshan makes its closest approach to the Sun. Mon, 25 Dec 2023 (187 days ago) in Leo

427.

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 (187 days ago) in Taurus

428.

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 (186 days ago) in Auriga

429.

Full Moon The Moon reaches full phase and is visible for much of the night. Tue, 26 Dec 2023 at 19:33 EDT (186 days ago) in Auriga

430.

Asteroid 5 Astraea at opposition Asteroid 5 Astraea makes closest approach to the Earth. Wed, 27 Dec 2023 at 21:22 EDT (185 days ago) in Orion

431.

The cluster NGC 2232 is well placed The open star cluster NGC 2232 (mag 4.2) in Monoceros culminates at around midnight local time. Fri, 29 Dec 2023 (183 days ago) in Monoceros

432.

The Rosette Nebula is well placed The Rosette Nebula (C49; mag 9.0) in Monoceros culminates at around midnight local time. Sat, 30 Dec 2023 (182 days ago) in Monoceros

433.

Jupiter ends retrograde motion Jupiter returns to its usual eastward motion after opposition. Sat, 30 Dec 2023 at 21:41 EDT (182 days ago) in Aries

434.

Comet 62P/Tsuchinshan reaches peak brightness Comet 62P/Tsuchinshan is forecast to reach the brightest point in its 2023 apparition. Sun, 31 Dec 2023 (181 days ago) in Leo

435.

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. Mon, 01 Jan 2024 at 10:28 EDT (180 days ago) in Leo

436.

The cluster Messier 41 is well placed The open star cluster M41 (NGC 2287; mag 4.5) in Canis Major culminates at around midnight local time. Tue, 02 Jan 2024 (179 days ago) in Canis Major

437.

The Earth at perihelion The Earth reaches its closest point to the Sun. Tue, 02 Jan 2024 at 19:38 EDT (179 days ago) in Pisces

438.

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, 03 Jan 2024 at 22:31 EDT (178 days ago) in Virgo

439.

Quadrantid meteor shower 2024 The Quadrantid meteor shower reaches its peak. Thu, 04 Jan 2024 (177 days ago) in Bootes

440.

Mercury at dichotomy Mercury reaches half phase in the dawn sky. Sun, 07 Jan 2024 at 03:06 EDT (174 days ago) in Ophiuchus