MIKE MOSS SAYS: Glenn, That would refer to the time at which the center of the sun's disk has fallen to 6 degrees of arc below the horizon after sunset. For more details, see the earlier Q&A at
http://www.wral.com/weather/blogpost/1168507/
or you can access that answer by typing "civil twilight" into the search box at the upper right corner of any page on our site.






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