Sunday, January 11, 2009

Full Moon Day after the Biggest Full Moon of 2009

Saturday Night Special: Biggest Full Moon of 2009
By Robert Roy Britt, Editorial Director of SPACE.com
If Skies were clear where you live, did you notice that at sunset last night the giant moon rising in the east? It was the biggest and brightest one of 2009, sure to wow even seasoned observers.
Earth, the moon and the sun are all bound together by gravity, which keeps us going around the sun and keeps the moon going around us as it goes through phases. The moon makes a trip around Earth every 29.5 days.
But the orbit is not a perfect circle. One portion is about 31,000 miles (50,000 km) closer to our planet than the farthest part, so the moon's apparent size in the sky changes. Saturday night (Jan. 10) the moonwas at perigee, the closest point to us on this orbit.
It appeared about 14 percent bigger in our sky and 30 percent brighter than some other full moons during 2009, according to NASA. (A similar setup occurred in December, making that month's full moon the largest of 2008.)
High tides
Tides were higher, too. Earth's oceans are pulled by the gravity of the moon and the sun. So when the moon is closer, tides are pulled higher. Scientists call these perigean tides, because they occur when the moon is at or near perigee. (The farthest point on the lunar orbit is called apogee.)
This month's full moon is known as the Wolf Moon from Native American folklore. The full moon's of each month are named. January's is also known as the Old Moon and the Snow Moon.

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