321.

The Rosette Nebula is well placed The Rosette Nebula (C49; mag 9.0) in Monoceros culminates at around midnight local time. Fri, 29 Dec 2017 (2,392 days ago) in Monoceros

322.

Mercury at highest altitude in morning sky Mercury is bright and well placed in the dawn sky. Thu, 28 Dec 2017 (2,392 days ago) in Ophiuchus

323.

The cluster NGC 2232 is well placed The open star cluster NGC 2232 (mag 4.2) in Monoceros culminates at around midnight local time. Thu, 28 Dec 2017 (2,393 days ago) in Monoceros

324.

Mercury at dichotomy Mercury reaches half phase in the dawn sky. Wed, 27 Dec 2017 at 18:29 EDT (2,394 days ago) in Ophiuchus

325.

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, 26 Dec 2017 at 04:20 EDT (2,395 days ago) in Pisces

326.

Ursid meteor shower 2017 The Ursid meteor shower reaches its peak. Fri, 22 Dec 2017 (2,399 days ago) in Ursa Minor

327.

Saturn at solar conjunction Saturn is unobservable as it passes around the far side of the Sun – marking the end of one apparition and the beginning of the next. Thu, 21 Dec 2017 at 15:59 EDT (2,400 days ago) in Sagittarius

328.

December solstice 21 December will be the shortest day of 2017 in the northern hemisphere. Thu, 21 Dec 2017 at 11:23 EDT (2,400 days ago) in Sagittarius

329.

December Leonis Minorid meteor shower 2017 The December Leonis Minorid meteor shower reaches its peak. Tue, 19 Dec 2017 (2,402 days ago) in Leo Minor

330.

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. Mon, 18 Dec 2017 at 21:39 EDT (2,403 days ago) in Sagittarius

331.

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, 18 Dec 2017 at 20:25 EDT (2,403 days ago) in Sagittarius

332.

New Moon The Moon disappears into the Sun's glare for a few days. Mon, 18 Dec 2017 at 01:31 EDT (2,403 days ago) in Sagittarius

333.

Asteroid 20 Massalia at opposition Asteroid 20 Massalia makes closest approach to the Earth. Fri, 15 Dec 2017 at 21:22 EDT (2,406 days ago) in Taurus

334.

Comae Berenicid meteor shower 2017 The Comae Berenicid meteor shower reaches its peak. Fri, 15 Dec 2017 (2,405 days ago) in Leo

335.

The Orion Nebula is well placed The Orion Nebula (M42; mag 4.0) culminates at around midnight local time. Fri, 15 Dec 2017 (2,406 days ago) in Orion

336.

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. Fri, 15 Dec 2017 (2,406 days ago) in Orion

337.

Close approach of the Moon and Jupiter The Moon and Jupiter pass close to each other. Thu, 14 Dec 2017 at 11:56 EDT (2,407 days ago) in Libra

338.

Conjunction of the Moon and Jupiter The Moon and Jupiter share the same right ascension, at a separation of 4°14'. Thu, 14 Dec 2017 at 09:26 EDT (2,407 days ago) in Libra

339.

Geminid meteor shower 2017 The Geminid meteor shower reaches its peak. Thu, 14 Dec 2017 (2,407 days ago) in Gemini

340.

Close approach of the Moon and Mars The Moon and Mars pass close to each other. Wed, 13 Dec 2017 at 14:12 EDT (2,408 days ago) in Virgo