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An alidade is a precision optical instrument used primarily in surveying and navigation to take accurate angular measurements. It typically consists of a sighting device, such as a telescope or a straightedge, mounted on a base or a transit. The instrument allows the user to align the alidade with a distant object, enabling the measurement of the angle relative to a reference line.

Ancestors (6)

  1. Surveying instruments
  2. Geodesy
  3. Applied mathematics
  4. Fields of mathematics
  5. Mathematics
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