Solar eclipse was real-life astronomy lesson for millions

This Sunday, May 20, was marked by an interesting astronomical phenomenon: an annular (ring-shaped) solar eclipse.David McNew/Getty Images(NEW YORK) -- If you live in a band across the southwestern United States, twilight likely seemed to come early Sunday afternoon, well before the sun actually sets. The cause: a rare annular solar eclipse -- a ring of sunlightA beautiful time-lapse video taken by a math instructor

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