WATCH LIVE: Supermoon 2013, the Year’s Biggest, Brightest Full Moon |
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** WATCH LIVE: Supermoon 2013, the Year’s Biggest, Brightest Full Moon **

Watch as the year's largest full moon -- also known as the supermoon or
perigee moon -- lights up the night sky

By Samantha Grossman @sam_grossmanJune 23, 2013

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At last, one of the greatest celestial events of the year has arrived.
That’s right, it’s supermoon time! This cosmic wonder occurs when the


when is it a full moon

Full moon - Wikipedia, the free encyclopedia


** Full moon **

From Wikipedia, the free encyclopedia
Jump to: navigation, search
For other uses, see Full moon (disambiguation).
"Harvest Moon" redirects here. For the video game, see Harvest Moon (video
Photograph of the full moon as viewed through a 9.25 inch
Schmidt-Cassegrain telescope. This moon was near its greatest northern
ecliptic latitude, so the southern craters are especially prominent.
Photograph of full moon during the partial lunar eclipse of June 26, 2010.

A *full moon* is the lunar phase that occurs when the Moon is completely
illuminated as seen from the Earth. This occurs when the Moon is in
opposition with the Sun (when it is on the opposite side of the Earth from
the Sun; more precisely, when the ecliptic longitudes of the Sun and Moon
differ by 180 degrees).^[1] This means that the hemisphere of the Moon that
is facing the Earth (the near side) is almost fully illuminated by the Sun
and appears round (while the far side is almost completely unilluminated).

Lunar eclipses can occur only at full moon, where the moon's orbit allows
it to pass through the Earth's shadow. Lunar eclipses do not occur every
month because the moon usually passes above or below the Earth's shadow
(which is mostly restricted to the ecliptic plane). Lunar eclipses can
occur only when the full moon occurs near the two nodes of the orbit,
either the ascending or descending node. This causes eclipses to only occur
about every 6 months, and often 2 weeks before or after a solar eclipse at
new moon at the opposite node.

The time interval between similar lunar phases—the synodic
month—averages about 29.53 days. Therefore, in those lunar calendars
in which each month begins on the new


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