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Earthsky Tonight—April 29, Moon and Scorpion rise as Orion sets
Posted By Gary Wamsley On April 28, 2010 @ 10:26 pm In Earth & Sky | Comments Disabled
Courtesy of EarthSky
A Clear Voice for Science
 Like clockwork, the constellations rise and set 4 minutes earlier with each passing day. Four minutes doesn’t sound like much, but it adds up after a while. For instance, the stars rise and set one-half hour earlier with each passing week, or 2 hours earlier with each passing month. That is 6 hours difference after one 3-month season.
In late April, the red supergiant star Antares  rises in the southeast around 11:00 p.m. local daylight saving time. About the same time that Antares rises, the red supergiant star Betelgeuse  sets in the west. For these stars’ precise rise/set times in your sky, check out the U.S. Naval Observatory .
Tonight, the waning gibbous moon  will precede Antares into the southeast sky by about an hour. Tomorrow, a somewhat smaller waning gibbous moon will rise at nearly the same time as Antares. The moon and Antares will rise fairly late on both nights. They will cross the sky westward together, and hover in the southwest sky at morning dawn.
Antares beams as the brightest star in the summer constellation Scorpius the Scorpion, and Betelgeuse vies with Rigel as the brightest star in the winter constellation Orion . According to myth, Orion and the Scorpion are archenemies, and the gods saw to it that the two constellations never appear in the same sky together.
By late May and early June, Betelgeuse will have disappeared from the evening sky, whereas Antares will shine from dusk until dawn!
Written by Bruce McClure
CHANDRA Photo Album 
StarDate Online 
Sky and Telescope 
National Geographic 
Space Com 
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/2010/04/10apr29_430.jpg
 Image: http://www.berthoudrecorder.com/wp-content/uploads/2010/04/Moon-15_phases.jpg
 Antares: http://earthsky.org/tonightpost/brightest-stars/antares-rivals-mars-as-the-scorpions-heart
 Betelgeuse: http://earthsky.org/tonightpost/brightest-stars/betelgeuse-will-explode-someday
 U.S. Naval Observatory: http://aa.usno.navy.mil/data/docs/mrst.php
 waning gibbous moon: http://earthsky.org/tonightpost/moon-phases/waning-gibbous
 Orion: http://earthsky.org/es-tonight/star-hopping-from-constellation-orion
 Orion descends in the west each evening: http://earthsky.org/tonighthome/2010-04-28/url
 Star hopping from the constellation Orion: http://earthsky.org/tonighthome/2010-04-30/url
 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
 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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