While people were gazing upward to witness Monday’s spectacular solar eclipse, shadows on the ground were just as fascinating. Some of them even looked like crescents.

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.

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Flights are shown cancelled on a screen at Hartsfield-Jackson Atlanta International Airport domestic terminal in Atlanta on Friday, Nov. 7, 2025. Cancellations at the Atlanta airport got worse over the weekend, as about 370 flights were canceled Saturday and about another 470 more by Sunday. (Arvin Temkar/AJC)

Credit: arvin.temkar@ajc.com

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Passengers wait at a Delta check-in counter at Hartsfield-Jackson Atlanta International Airport on Friday, Nov. 7, 2025. It was the first day the Federal Aviation Administration cut flight capacity at airports during the government shutdown. (Arvin Temkar/AJC)

Credit: arvin.temkar@ajc.com