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Astronomy Picture of the Day -- The Umbra of Earth
| December 15, 2011
| (see photo credit)
Posted on 12/14/2011 9:29:58 PM PST by SunkenCiv
Explanation: The dark, inner shadow of planet Earth is called the umbra. Shaped like a cone extending into space, it has a circular cross section most easily seen during a lunar eclipse. For example, last Saturday the Full Moon slid across the southern half of Earth's umbral shadow, entertaining moonwatchers around much of the planet. In the total phase of the eclipse, the Moon was completely within the umbra for 51 minutes. Recorded from Beijing, China, this composite eclipse image uses successive pictures from totality (center) and partial phases to trace out a large part of the umbra's curved edge. Background stars are visible in the darker eclipse phases. The result shows the relative size of the shadow's cross section at the distance of the Moon, as well as the Moon's path through Earth's umbra.
(Excerpt) Read more at 18.104.22.168 ...
TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: apod; astronomy; lunareclipse; science
[Credit & Copyright: Wang, Letian]
posted on 12/14/2011 9:30:08 PM PST
To: brytlea; cripplecreek; decimon; bigheadfred; KoRn; Grammy; married21; steelyourfaith; Mmogamer; ...
posted on 12/14/2011 9:31:14 PM PST
(Merry Christmas, Happy New Year! May 2013 be even Happier!)
It’s a great pic.
posted on 12/14/2011 9:35:12 PM PST
(If a person won't learn under the best of times, then he must learn under the worst of times.)
posted on 12/14/2011 9:43:52 PM PST
(( obama"care" violates the 1890 Sherman Anti-Trust Law, AND is illegal by the U.S. Constitution.))
You are a Freeper treasure. Thanks for the post. BTTT.
posted on 12/14/2011 9:47:36 PM PST
by PA Engineer
(Time to beat the swords of government tyranny into the plowshares of freedom.)
Awesome, as usual. Thank you, SunkenCiv.
posted on 12/14/2011 10:23:42 PM PST
(Silence Is Consent)
Think of all the conditions required to make an eclipse possible. The distance from the sunto the earth/mooon system. The distance between the earth and the moon. The size of the earth. The size of the moon. Nowhere else in the solar system will you find this same combination.
Thanks for the picture.
posted on 12/15/2011 3:26:58 AM PST
( You live and learn. Or you don't live long.)
posted on 12/15/2011 5:47:09 AM PST
(An ounce of chocolate is worth a pound of cure)
posted on 12/15/2011 7:22:58 AM PST
(The heart of the wise inclines to the right, but the heart of the fool to the left (Eccl. 10:2, NIV))
Oooooh! That is a perfect picture. The shadow of the earth on the moon showing the relative size of the two bodies. Ahhh! Spectacular! I don’t save many of these APODs, but this one is a keeper.
posted on 12/15/2011 7:34:16 PM PST
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