According to World Book, in the minute or two before and after the sun is totally blocked, people may notice thin stripes of dark and light shadows moving rapidly, as if in waves.
They are called shadow bands or snake bands. Scientists are unsure what causes it, but it is the same phenomenon that causes stars to twinkle, World Book reported.
Don't forget to look down! Crescents in the tree shadows. #Eclipse2017 #Boulder #MesaLab pic.twitter.com/FwamXXkqLQ
— NCAR & UCAR Science (@AtmosNews) August 21, 2017
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