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A table listing some of the Astronomical Phenomena for December 2017:

Phenomena December

Day (UT)Time (UT)Event
307:49Mercury (mag. 0.2) begins retrograde motion.
313:25Moon 0.8 degrees north of Aldebaran (mag. 0.9), occultation visible from northeast Asia, Alaska, northwest Canada.
315:48Full moon.
408:52Moon is at perigee, approx. 357,495 kilometres or 222,137 miles from the Earth.
612:31Moon 8.7 degrees south of Pollux (mag. +1.1).
723:46Vesta (mag. 7.9) 4.4 degrees north of Jupiter (mag. -1.7).
817:16Venus (mag. -3.9) 5.1 degrees north of Antares (mag. 1.0).
822:51Moon 0.7 degrees north of Regulus (mag. +1.4), occultation visible from northern Europe, northern Asia.
1007:52Last quarter moon.
1211:48Mercury is at perihelion 0.307 AU (approx. 45.9 million kilometres or 28.5 million miles) from the Sun.
1221:26Moon 7.2 degrees north of Spica (mag. +1.0).
1302:59Mercury is at inferior conjunction.
1316:28Mars (mag. 1.6) 4.2 degrees south of Moon.
1406:00Geminids meteor shower peaks (ZHR = 120)
1414:26Jupiter (mag. -1.7) 4.2 degrees south of Moon.
1418:35Vesta (mag. 7.9) 0.2 degrees north of Moon.
1618:17Moon 9.4 degrees north of Antares (mag. 1.0).
1806:31New moon.
1901:43Moon is at apogee, approx. 406,604 kilometres or 252,652 miles from the Earth.
2116:29Winter Solstice NH - Summer Solstice SH.
2120:06Ceres (mag. 7.8) begins retrograde motion.
2121:10Saturn is in conjunction with the Sun .
2215:00Ursids meteor shower peaks (ZHR = 10 - occasionally up to 50)
2302:42Mercury (mag. 0.3) begins direct motion.
2412:40Neptune (mag. 7.9) 1.4 degrees north of Moon.
2609:21First quarter moon.
2718:02Uranus (mag. 5.8) 4.5 degrees north of Moon.
3100:50Moon 0.8 degrees north of Aldebaran (mag. 0.9).