1.

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. Thu, 11 Dec 2025 at 12:52 PST (13 days ago) in Leo

2.

σ-Hydrid meteor shower 2025 The σ-Hydrid meteor shower reaches its peak. Thu, 11 Dec 2025 (12 days ago) in Hydra

3.

The Large Magellanic Cloud is well placed The Milky Way's dwarf companion, the Large Magellanic Cloud (LMC; mag 0.9), in Dorado culminates at around midnight local time. Fri, 12 Dec 2025 (12 days ago) in Dorado

4.

Geminid meteor shower 2025 The Geminid meteor shower reaches its peak. Sat, 13 Dec 2025 (10 days ago) in Gemini

5.

The Running Man cluster is well placed The Running Man cluster NGC 1977 (mag 4.2) in Orion's sword culminates at around midnight local time. Mon, 15 Dec 2025 (9 days ago) in Orion

6.

The Orion Nebula is well placed The Orion Nebula (M42; mag 4.0) culminates at around midnight local time. Mon, 15 Dec 2025 (9 days ago) in Orion

7.

Comae Berenicid meteor shower 2025 The Comae Berenicid meteor shower reaches its peak. Mon, 15 Dec 2025 (8 days ago) in Leo

8.

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, 16 Dec 2025 at 22:08 PST (8 days ago) in Libra

9.

Conjunction of the Moon and Mercury The Moon and Mercury share the same right ascension, at a separation of 6°09'. Thu, 18 Dec 2025 at 04:14 PST (6 days ago) in Ophiuchus

10.

December Leonis Minorid meteor shower 2025 The December Leonis Minorid meteor shower reaches its peak. Fri, 19 Dec 2025 (4 days ago) in Leo Minor

11.

New Moon The Moon disappears into the Sun's glare for a few days. Fri, 19 Dec 2025 at 17:44 PST (5 days ago) in Sagittarius

12.

The Moon at perihelion The Moon passes its closest point to the Sun, a monthly occurrence around the time of new moon. Sat, 20 Dec 2025 at 07:58 PST (4 days ago) in Sagittarius

13.

December solstice 21 December will be the shortest day of 2025 in the northern hemisphere. Sun, 21 Dec 2025 at 07:04 PST (3 days ago) in Sagittarius

14.

Ursid meteor shower 2025 The Ursid meteor shower reaches its peak. Mon, 22 Dec 2025 (2 days ago) in Ursa Minor

15.

Close approach of the Moon and Saturn The Moon and Saturn pass close to each other. Fri, 26 Dec 2025 at 16:08 PST (2 days away) in Aquarius

16.

Conjunction of the Moon and Saturn The Moon and Saturn share the same right ascension, at a separation of 4°01'. Fri, 26 Dec 2025 at 19:34 PST (2 days away) in Aquarius

17.

Moon at First Quarter The Moon reaches first quarter phase – appearing high in the sky at sunset and remaining visible until around midnight. Sat, 27 Dec 2025 at 11:10 PST (3 days away) in Pisces

18.

The cluster NGC 2232 is well placed The open star cluster NGC 2232 (mag 4.2) in Monoceros culminates at around midnight local time. Sun, 28 Dec 2025 (4 days away) in Monoceros

19.

The Rosette Nebula is well placed The Rosette Nebula (C49; mag 9.0) in Monoceros culminates at around midnight local time. Mon, 29 Dec 2025 (5 days away) in Monoceros

20.

Close approach of the Moon and M45 The Moon and M45 pass close to each other. Wed, 31 Dec 2025 at 05:45 PST (7 days away) in Taurus