In Greek mythology, Chronos ( not the guy who ate his kids), the primordial god of time, was depicted as a giant snake with three heads: a man, a bull, and a lion. Chronos and his consort, the goddess of inevitability, Ananke, circle around the cosmos and drive the rotation of heaven and the eternal passage of time.

This description potentially speaks to how ancient societies viewed time: primordial, grand, and inevitable. It’s probably not too different from the way we think of time (philosophically, anyway), but today, we have an incredible tool: modern science. This has led not just to more objective standards but also to discoveries in…

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