21.

Ursid meteor shower The Ursid meteor shower reaches its peak. Sat, 22 Dec 2018 (274 days ago) in Ursa Minor

22.

Full Moon The Moon is visible for much of the night. Sat, 22 Dec 2018 at 12:50 EDT (274 days ago) in Orion

23.

The Moon at aphelion The Moon reaches its furthest point from the Sun. Fri, 21 Dec 2018 at 21:23 EDT (275 days ago) in Taurus

24.

December solstice 21 December will be the shortest day of 2018 in the northern hemisphere. Fri, 21 Dec 2018 at 17:09 EDT (275 days ago) in Sagittarius

25.

Conjunction of Jupiter and Mercury Jupiter and Mercury share the same right ascension, at a separation of 0°51'. Fri, 21 Dec 2018 at 09:41 EDT (275 days ago) in Ophiuchus

26.

December Leonis Minorid meteor shower The December Leonis Minorid meteor shower reaches its peak. Thu, 20 Dec 2018 (276 days ago) in Leo Minor

27.

Asteroid 433 Eros at opposition Asteroid 433 Eros is well placed for observation. Wed, 19 Dec 2018 at 09:24 EDT (277 days ago) in Camelopardalis

28.

46P/Wirtanen reaches its brightest 46P/Wirtanen is well placed for observation. Sun, 16 Dec 2018 (280 days ago) in Taurus

29.

Comae Berenicid meteor shower The Comae Berenicid meteor shower reaches its peak. Sun, 16 Dec 2018 (280 days ago) in Leo

30.

Mercury at greatest elongation west Mercury is bright and well placed in the dawn sky. Sat, 15 Dec 2018 at 10:17 EDT (281 days ago) in Scorpius

31.

Moon at First Quarter The Moon appears high in the sky at sunset and sets in the west at around midnight. Sat, 15 Dec 2018 at 06:51 EDT (281 days ago) in Aquarius

32.

Close approach of the Moon and Mars The Moon and Mars pass within 3°21' of each other. Fri, 14 Dec 2018 at 20:53 EDT (282 days ago) in Aquarius

33.

Conjunction of the Moon and Mars The Moon and Mars share the same right ascension, at a separation of 3°33'. Fri, 14 Dec 2018 at 18:23 EDT (282 days ago) in Aquarius

34.

Mercury reaches highest point in morning sky Mercury is bright and well placed in the dawn sky. Fri, 14 Dec 2018 (282 days ago) in Scorpius

35.

Geminid meteor shower The Geminid meteor shower reaches its peak. Fri, 14 Dec 2018 (282 days ago) in Gemini

36.

Venus reaches highest point in morning sky Venus is bright and well placed in the dawn sky. Fri, 14 Dec 2018 (282 days ago) in Libra

37.

46P/Wirtanen at perihelion 46P/Wirtanen makes its closest approach to the Sun. Thu, 13 Dec 2018 (283 days ago) in Taurus

38.

The Moon at apogee The Moon appears small as it recedes to its furthest point from the Earth. Wed, 12 Dec 2018 at 07:26 EDT (284 days ago) in Capricornus

39.

σ-Hydrid meteor shower The σ-Hydrid meteor shower reaches its peak. Wed, 12 Dec 2018 (284 days ago) in Hydra

40.

Mercury at dichotomy Mercury reaches half phase in the dawn sky. Tue, 11 Dec 2018 at 07:31 EDT (285 days ago) in Libra