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I tell time by copying the sun's refusal to stand still; indoors I am useless, and at noon I almost disappear. What am I?

Type:LogicScienceTime

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Hint: The gnomon casts me.

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The answer is

A sundial's shadow

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A sundial uses the position of a shadow cast by its gnomon to show time. Indoors it lacks sunlight, and near noon the shadow is shortest.

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