Stonehenges
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A plethora of Stonehenges
Who built the first observatory?
Observatories, like so much of astronomy, are truly ancient features of human culture; retracing the steps of the first person
Who made the first map of the universe?
Maps of the stars are nearly as ancient as human culture itself; inscriptions describing the positions of stars and constellations
How was the size of Earth first measured?
Earth’s circumference was first accurately measured more than 2,000 years ago by the Greek astronomer Eratosthenes, who at the time