Machu Picchu
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What links here
Gnomon
List of inventors
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Diptych
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Sundial
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10 BC
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Camera obscura
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Babylonia
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Eratosthenes
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Ulugh Beg
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Tool
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Time
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Thales of Miletus
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Solstice
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Roman Empire
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Pytheas
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History of science
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Hyperbola
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History of astronomy
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Hipparchus
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Great Pyramid of Giza
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History of geometry
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Chinese calendar
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Clock
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Chinese philosophy
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Augustus
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Anaximander
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Sun City, Arizona
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Carefree, Arizona
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Seshat
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Axial tilt
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