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Horizontal sundial

The commonest form of sundial, in which the shadow of a gnomon whose edge is parallel to the earth's axis falls on a horizontal surface. Usually this carries only the hour lines, but occasionally a ring showing the equation of time is added. Portable horizontal sundials take many forms; in the diptych form the gnomon is a tautened string; in the small accessory dials showing Italian and Babylonian hours it is a short vertical pin.

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  • Part of Speech: noun
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  • Industry/Domain: Chronometry
  • Category: Clock
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