December Moon at Perigee

   Our Moon reaches perigee, (closest distance to Earth), for this orbit, on Wednesday December 18th. At that time the Moon will be at a distance of 26.025 Earth diameters, 230,069 miles (370,260 km) from the Earth.

   On the day of the perigee Moon the 22-day old waning gibbous Moon will be over the south-southwestern horizon at sunrise local time. The planet Mars is also visible over the southeastern horizon. If your local eastern horizon is low enough then the innermost planet, Mercury, might be seen near the reddish star Antares in Scorpius the Scorpion.

   Does our Moon actually go around the Earth as this graphic shows? From our perspective on the Earth the Moon appears to circle around the Earth. However, in reality, the Moon orbits the Sun together with the Earth*
   *Click here to read my 2006 Scope on the Sky column “The Real Shape of the Moon’s Orbit”. (PDF)

   
   
   

Click here to go to the Qué tal in the Current Skies web site for monthly observing information, or here to go to bobs-spaces.


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