Saturday, January 10, 2009

SciAm: Tonight's moon will rival last month's massive bright perigee

Exciting! I knew the moon looked brighter last night!
Remember last month's massive moon, the one that dazzled onlookers on December 12? That moon was 14% larger and 30% brighter than a typical full moon.

Well, it's back tonight. NASA says tonight's moon will be the biggest full moon of 2009, "almost identical" to the one on December 12.

Here's what's going on: The moon's orbit of Earth is an ellipse, with one end closer to Earth than the other. Tonight, the moon will be near the closer end of the ellipse, a spot known as the perigee. (Apogee is the more distant end.)

I hope it's clear out. Last time it was an amazing night. 

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