How Did the Ancient Sun Dial Work?

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The ancient sun dial reveals the hours in a day. It has a surface with hour lines and a stick or gnomon which casts a shadow as the sun advances in its daily course. The sun dial is mentioned in the Bible as far back as the time of King Ahaz. Herodotus mentions that the sun dial was in use before his time in Babylonia.

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Sun Dial Sketch

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