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From the author of   Sizing Up The Universe

The moon's orbit about the Earth is not a perfect circle---it is a bit eccentric (just like me). As a result, during part of its orbit it is a little closer to us than at other times. The closest approach is called perigee. The greatest separation is called apogee. On average, the moon's distance is 385,000 kilometers. At perigee it is about 350,000 kilometers away, whereas at apogee it is about 406,000 kilometers away.

Shown below are a few pairs of pictures of the Moon taken with the same equipment. When the Moon is close, it appears larger than when it is further away.

A full Moon at perigee is called a SUPERMOON.

Distance = 396,839 km
19:01 EST, Apr 6, 2014
Canon XSi (450D) on 10" RC
Stack of 8 images. Each image 1/1000 sec at ISO 1600.
Distance = 353,615 km
23:30 EDT, Aug 9, 2014
Canon XSi (450D) on 10" RC
Five 4-panel mosaics. Various exposures at ISO 200 and 800.

Distance = 354,192 km
23:46 EDT, Mar 19, 2011
Canon XSi (450D) on 10" RC
4 panel mosaic. Each panel is 3 images of 1/320 seconds and ISO 400.
Distance = 375,820 km
20:40 EST, Dec 19, 2010
Canon XSi (450D) on 10" RC
2 panel mosaic. Each panel is one image of 1/80 seconds and ISO 100.

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