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At Uxmal, Mexico, a tapered stone marker in front of the Pyramid of the Magician casts a minimum shadow when the Sun reaches the zenith—the point directly overhead. This happens only twice a year, and the first zenith passage in May correlates with the onset of the rainy season. (Image credit: Bryan Mendez, UC Berkeley)
At Uxmal, Mexico, a tapered stone marker in front of the Pyramid of the Magician casts a minimum shadow when the Sun reaches the zenith—the point directly overhead. This happens only twice a year, and the first zenith passage in May correlates with the onset of the rainy season. (Image credit: Bryan Mendez, UC Berkeley)
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