EarthSky Tonight—October 12, Arcturus sparkles in western sky on October evenings
every year at this time, we get questions about three different stars that are flashing different colors.
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every year at this time, we get questions about three different stars that are flashing different colors.
Capella is located at one corner of the constellation Auriga. Capella marks the Charioteer’s left shoulder.
Capella’s red and green flashes do not come from the star itself. They come from refraction of Capella’s light by our atmosphere, when this star is low in the sky.
The atmosphere splits or “refracts” the star’s light, just as a prism splits sunlight.
As darkness falls, there are several ways to distinguish the brilliant star Capella from the other bright stars in the western half of sky.
onight, the waxing gibbous moon shines in front of the constellation Gemini, and is flanked by two beautiful stars. To the north of the moon is Capella, the beacon star…
The rather wide waxing crescent moon will be shining in between two brilliant stars tonight. Capella, the brightest star in the constellation Auriga, will be beaming north of the moon,…