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EarthSky Tonight—December 6, Winter Circle up by late evening
Posted By Editor On December 5, 2010 @ 10:53 pm In Earth & Sky | Comments Disabled
Courtesy of EarthSky
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 You will have to stay up until 9 or 10 p.m. tonight to see the exceptionally brilliant and huge Winter Circle filling up the eastern portion of sky. This famous sky pattern is not a constellation. It is an asterism: a noticeable pattern on the sky’s dome. In this case, the pattern is made of the brightest stars of winter, in many different constellations.
From a dark sky, you will see the Milky Way’s hazy band of stars passing right through the Winter Circle.
The southernmost and brightest star of the Winter Circle is Sirius. It will be the last to rise tonight. Look for dazzling Sirius to sparkle wildly over the southeast horizon around 9 to 10 p.m. tonight.
This year, the brightest stars of winter appear less brilliant, because there is an even-brighter planet nearby. This planet is Jupiter, by far the brightest star-like object in the evening sky now. Jupiter is up earlier than the Winter Circle stars. You will find it shining due south in our sky around 6:30 p.m. local time.
Be sure to note where Jupiter resides relative to the horizon at early evening. This giant world will move westward as evening deepens, to set fairly close to due west after midnight.
At nightfall, most of the stars of the Winter Circle will remain hidden beneath the eastern horizon. However, as our world spins eastward on its axis, the stars beneath the eastern horizon will eventually rise into the eastern sky. In addition, the stars in the western sky will eventually set beneath the horizon.
Watch the Winter Circle stars march westward throughout the night. The Winter Circle will swing into the southeast sky by mid to late evening and into the southern sky after midnight. By the wee hours before dawn, the Winter Circle will have moved across the entire sky, so that it is hovering over the western horizon.
Written by Bruce McClure 
Universe Today 
StarDate Online 
Sky and Telescope 
National Geographic 
Space Com 
Simostronomy Blog 
Amazing Space 
Scope City 
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URLs in this post:
 www.EarthSky.org: http://www.EarthSky.org
 Image: http://www.berthoudrecorder.com/wp-content/uploads/2010/12/phase06.gif
 Image: http://www.berthoudrecorder.com/wp-content/uploads/2010/12/10dec06.jpg
 Winter Circle: Brightest winter stars: http://earthsky.org/favorite-star-patterns/winter-circle-highlights-brightest-winter-stars
 Sirius: Dog Star and brightest star: http://earthsky.org/brightest-stars/sirius-the-brightest-star
 Bruce McClure: http://earthsky.org/author/brucemcclure/
 Astronomy Picture of the Day from NASA/JPL: http://antwrp.gsfc.nasa.gov/apod/
 CHANDRA Photo Album: http://chandra.harvard.edu/photo/
 U.S. Naval Observator Astronomical Information cente: http://www.usno.navy.mil/USNO/astronomical-applications/astronomical-information-center/astronomical-information-center
 Universe Today: http://www.universetoday.com/
 StarDate Online: http://stardate.org/
 Sky and Telescope: http://www.skyandtelescope.com/observing/ataglance/
 National Geographic: http://news.nationalgeographic.com/news/
 Space Com: http://www.space.com/nightsky/
 Simostronomy Blog: http://simostronomy.blogspot.com/
 Amazing Space: http://amazing-space.stsci.edu/tonights_sky/
 The York County Astronomical Society: http://www.ycas.org/tonights_sky.htm
 Scope City: http://www.scopecity.net/
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