261.

Mercury at greatest elongation west Mercury is bright and well placed in the dawn sky. Sun, 07 Dec 2025 at 19:14 EDT (141 days away) in Libra

262.

Asteroid 16 Psyche at opposition Asteroid 16 Psyche makes closest approach to the Earth. Sun, 07 Dec 2025 at 21:22 EDT (141 days away) in Taurus

263.

Monocerotid meteor shower 2025 The Monocerotid meteor shower reaches its peak. Mon, 08 Dec 2025 (143 days away) in Monoceros

264.

Lunar occultation of Regulus The Moon will pass in front of Regulus (Alpha Leonis), creating a lunar occultation visible from countries and territories including Canada, Greenland, Svalbard and Iceland amongst others. Wed, 10 Dec 2025 at 02:47 EDT (144 days away) in Leo

265.

Neptune ends retrograde motion Neptune returns to its usual eastward motion after opposition. Wed, 10 Dec 2025 at 07:13 EDT (144 days away) in Pisces

266.

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 15:52 EDT (145 days away) in Leo

267.

σ-Hydrid meteor shower 2025 The σ-Hydrid meteor shower reaches its peak. Thu, 11 Dec 2025 (146 days away) in Hydra

268.

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 (146 days away) in Dorado

269.

Geminid meteor shower 2025 The Geminid meteor shower reaches its peak. Sun, 14 Dec 2025 (148 days away) in Gemini

270.

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 (149 days away) in Orion

271.

The Orion Nebula is well placed The Orion Nebula (M42; mag 4.0) culminates at around midnight local time. Mon, 15 Dec 2025 (149 days away) in Orion

272.

Comae Berenicid meteor shower 2025 The Comae Berenicid meteor shower reaches its peak. Mon, 15 Dec 2025 (150 days away) in Leo

273.

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. Wed, 17 Dec 2025 at 01:08 EDT (151 days away) in Libra

274.

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 07:14 EDT (152 days away) in Ophiuchus

275.

Comet 240P/NEAT passes perihelion Comet 240P/NEAT makes its closest approach to the Sun. Fri, 19 Dec 2025 (153 days away) in Aries

276.

December Leonis Minorid meteor shower 2025 The December Leonis Minorid meteor shower reaches its peak. Fri, 19 Dec 2025 (154 days away) in Leo Minor

277.

New Moon The Moon disappears into the Sun's glare for a few days. Fri, 19 Dec 2025 at 20:44 EDT (153 days away) in Sagittarius

278.

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. Sat, 20 Dec 2025 at 10:58 EDT (154 days away) in Sagittarius

279.

December solstice 21 December will be the shortest day of 2025 in the northern hemisphere. Sun, 21 Dec 2025 at 10:04 EDT (155 days away) in Sagittarius

280.

Ursid meteor shower 2025 The Ursid meteor shower reaches its peak. Mon, 22 Dec 2025 (156 days away) in Ursa Minor