On the matter of Civil Twilight


Joe Bollinger, in Glen Burnie, asks: “What time did twilight begin and end on June 21st, and is the length of twilight the same on the winter solstice?” Civil Twilight begins when the center of the sun’s disk is 6 degrees below the horizon, and ends when it’s 6 degrees below the horizon after sunset.

Civil Twilight on June 21 began at 5:08 a.m. EDT, 32 minutes before sunrise. It ended at 9:09 p.m., 32 minutes after sunset. On the winter solstice, Dec. 22, twilight will be 30 minutes long.  

(SUN PHOTO: Jed Kirschbaum, 2008)

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