DR JUERG ALEAN / SCIENCE PHOTO LIBRARY DR JUERG ALEAN / SCIENCE PHOTO LIBRARY
Shadow effects under a tree during the partial phase of the total solar eclipse of August 21st 2017. Normally Sun spots in the shadow of a tree appear round, because the Sun itself is round. However, when the Sun is partially obscured by the Moon, the Sun spots take on the same shape as the Sun and, therefore, appear sickle-shaped. Photographed near Idaho Falls, Idaho, USA.
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