February Apogee Moon

18mar-apogee_moon Our Moon reaches apogee, (greatest distance from Earth), on Saturday February 18th. At that time the Moon will more or less be at a distance of 31.70 Earth diameters (404,650 km or 251,438 miles) from the Earth.
   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 as they both rotate around a common balance point, the barycenter.*

*Click here to read my 2006 Scope on the Sky column “The Real Shape of the Moon’s Orbit”. (PDF)

Read this very informative article about the Earth-Moon system and their orbital motions, written by Joe Hanson. “Do We Orbit the Moon?”

   On the day of the apogee Moon the 21-day old last quarter Moon rises a couple of hours before the Sun and is visible over the southern horizon before sunrise.

   
   
   

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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