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Vertical sundial
In this type of dial the shadow of a gnomon whose edge is parallel to the Earth's axis falls on a vertical surface; if this is due south, the hour lines will be symmetrically placed. Vertical sundials are normally seen on the walls of buildings, but they also appear as the upper members of diptych portable dials and on the sides of polyhedral dials.
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- Part of Speech: noun
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- Industry/Domain: Chronometry
- Category: Clock
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