December Moon & Planet data for 2017


The follwing table lists various solar system object events during December. A list of astronomical terms used in may be found after the table.

December 3 Mercury stationary
December 3 Aldebaran 0.8 degrees south of the Moon Occn
December 3 Moon full
December 4 Moon at perigee
December 5 Moon northern most declination (20.0 degrees)
December 6 Mercury 1.4 degrees south of Saturn
December 8 Regulus 0.7 degrees south of the Moon Occn
December 9 Venus 5.0 degrees north of Antares
December 10 Moon last quarter
December 13 Mercury inferior conjunction
December 13 Mars 3.9 degrees south of the Moon
December 14 Jupiter 4.0 degrees south of the Moon
December 15 Mercury 2.2 degrees north of Venus
December 17 Mercury 1.8 degrees south of the Moon
December 17 Venus 4.1 degrees south of the Moon
December 18 Moon new
December 18 Saturn 2.7 degrees south of the Moon
December 19 Moon at apogee
December 19 Moon southern most declination (-20.1 degrees)
December 20 Pluto 1.9 degrees south of the Moon
December 21 Solstice
December 21 Saturn at conjunction
December 23 Mercury stationary
December 24 Neptune 1.4 degrees north of the Moon
December 25 Venus 1.1 degrees south of Saturn
December 26 Moon first quarter
December 27 Uranus 4.2 degrees north of the Moon
December 31 Aldebaran 0.8 degrees south of the Moon Occn
  • apogee: Furtherest point in the orbit of a body orbiting the Earth
  • conjunction: Two astronomical objects are 'lined up' (have the same right ascension) when viewed from Earth. If only one object is mentioned the Sun is generally the other object.
  • declination: 'Latitude' for celestial objects. The distance in degress above (north) or below (south) the celestial equator.
  • inferior conjunction: Conjunction where a solar system object is between the Earth and the Sun
  • perigee: Nearest point in the orbit of a body orbiting the Earth