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EarthSky Tonight – December 22, See the Summer Triangle in winter
Posted By Gary Wamsley On December 22, 2009 @ 10:54 am In Earth & Sky | Comments Disabled
Courtesy of EarthSky
A Clear Voice for Science
If you’re driving around tonight, maybe visiting friends or looking at holiday lights, be sure to look for some noteworthy lights in the sky as well. In the west, shortly after sunset, you’ll find a famous “asterism, ” or noticeable pattern of stars, known as the Summer Triangle.
The Triangle consists of three bright stars in three different constellations. They are Vega in the constellation Lyra the Harp, Deneb in the constellation Cygnus the Swan, and Altair in the constellation Aquila the Eagle. It’s called the “summer” triangle, because, for us in the northern hemisphere, summer is the season in which these stars soar overhead. Still, if you look for this pattern this month you’ll find that, around the time of the winter solstice, the Summer Triangle is descending in the west in early evening. It’s getting closer each evening to disappearing into the sunset glare.
Written by Deborah Byrd
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