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EarthSky Tonight—August 21, Summer Triangle high overhead on summer evenings
Posted By Gary Wamsley On August 21, 2010 @ 7:53 am In Earth & Sky | Comments Disabled
Courtesy of EarthSky
A Clear Voice for Science
 Our sky chart shows the Summer Triangle asterism as it appears at late evening. As seen from mid-northern latitudes, Vega – the Summer Triangle’s brightest star – shines high overhead around 10:00 p.m. daylight saving time (9:00 p.m. standard time) this evening. Altair resides to the lower left (southeast) of Vega, and Deneb lies to Vega’s left (east).
As the stars drift westward during the night, Deneb will swing upward, to replace Vega as the overhead star some two hours later, or around midnight. Of course, the stars aren’t really moving. It is the Earth’s rotation that causes the stars to move westward during the night, and the sun to go westward during the day.
The three stars of the Summer Triangle shine so wonderfully brilliantly that you can see them from light-polluted cities or on a moonlit night. Yes, the sky will be drenched in moonlight tonight. Outside of our sky chart, tonight’s almost-full waxing gibbous moon  beams beneath the Summer Triangle and rather close to the horizon.
South of the equator, people see an “upside-down” version of tonight’s sky scene. At this hour, southern hemisphere residents will see the moon way high in the sky, Altair at the top of the Summer Triangle, and Vega and Altair sparkling at bottom.
Written by Bruce McClure 
Universe Today 
StarDate Online 
Sky and Telescope 
National Geographic 
Space Com 
Amazing Space 
Scope City 
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URL to article: http://www.berthoudrecorder.com/2010/08/21/earthsky-tonight%e2%80%94august-21-summer-triangle-high-overhead-on-summer-evenings/
URLs in this post:
 www.EarthSky.org: http://www.EarthSky.org
 Image: http://www.berthoudrecorder.com/2010/08/21/earthsky-tonight%e2%80%94august-21-summer-triangle-high-overhead-on-summer-evenings/phaseaug-21/
 Image: http://www.berthoudrecorder.com/2010/08/21/earthsky-tonight%e2%80%94august-21-summer-triangle-high-overhead-on-summer-evenings/10aug21_430-2/
 waxing gibbous moon: http://earthsky.org/moon-phases/waxing-gibbous
 Summer Triangle: Vega, Deneb, Altair: http://earthsky.org/favorite-star-patterns/the-summer-triangle-roadmap-to-the-milky-way
 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/
 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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