Archaeoastronomy

The Antikythera mechanism — a geared bronze computer recovered from a Roman-era shipwreck — could predict lunar and solar eclipses, model the irregular motion of the Moon, and track multiple calendar cycles simultaneously. It was built around 100 BCE. Nothing of comparable mechanical complexity appears in the archaeological record for another 1,400 years.

But the Antikythera device is only the most dramatic example of a much broader pattern: ancient cultures around the world demonstrating astronomical knowledge that seems disproportionate to what we’d expect from their technological level.

Göbekli Tepe’s enclosures appear to be oriented toward specific stellar rising points. The Nazca lines in Peru align with solstices and equinoxes. Newgrange in Ireland was engineered so that sunrise on the winter solstice illuminates its inner chamber through a precisely designed roof box. The Egyptian pyramids at Giza align with cardinal directions to within a fraction of a degree.

Archaeoastronomy asks what this knowledge was for, how it was developed, and whether it points to a tradition of systematic sky-watching far older than our textbooks suggest.