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Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

See Explanation. Clicking on the picture will download the highest resolution version available.

Largest Full Moon of 2009

Explanation: A larger moon will not be seen this year. This past weekend, the largest full Moon of 2009 could be seen from almost any clear location on planet Earth at night . The large angular extent of the full Moon was caused by the Moon being unusually close to Earth during its full phase . Because the Moon circles the Earth in an elliptical orbit , its angular size depends on how close the Moon is to closest approach (perigee) or farthest distance ( apogee ). Even so, the Moon's was only about 15 percent larger in area and brightness than a more typical full Moon. In this image , a dramatically positioned Moon is seen rising above the Alps from Breil-sur-Roya in the southeast of France. Taken with an ordinary digital camera but extraordinary timing, the image also captured a crossing jet plane . The last full Moon, in 2008 December, was the largest full moon of 2008 .

Date January 13, 2009
Credit Credit & Copyright: Vincent Jacques Sky Shows
Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
A service of: ASD at NASA / GSFC,
NASA Science Activation & Michigan Tech. U.