In this Dec. 11, 2019 photo Bill Donahue, a retired teacher and director of laboratories at St. John's College, uses an armillary sphere to track planetary rotations and explore the history of astronomy in Santa Fe, N.M. The unique precision-steel replica of an instrument created by Danish astonomer Tycho Brahe was commissioned by graduates of the college where students trace the evolution of math and science from early civilizations. (AP Photo/Morgan Lee)
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