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alidade


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  • Archaeology
  • Astronomy and Astrophysics

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A simple sighting device for measuring altitudes. It consists of a bar pivoted so as to swing in a vertical plane and be aligned with a celestial object. The object's altitude can then be read off from a scale. Alidades were often incorporated in ancient position-measuring instruments, such as astrolabes.

Subjects: Archaeology — Astronomy and Astrophysics.


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