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Because the Sun is (relatively speaking) standing still while the Earth spins like a carousel, the shadows move from west to east, getting shorter from sunset to noon and longer from noon to sunset. It's so regular, you could set your watch by it!

In fact, for most of history the timepiece was (to the extent that one existed at all) a SUNDIAL - telling the time by the shadow cast by the gnomon.

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15y ago

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