Intihuatana Stone, Machu Picchu, c. 1450 AD
Intihuatana Stone, Machu Picchu — a carved granite pillar aligned to the cardinal directions and the sun's path, thought to serve as an astronomical calendar. At the winter solstice the sun stands directly above it, casting no shadow — a moment the Inca called the hitching of the sun. © Jonny Green, CC BY 2.0, via Wikimedia Commons

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