Astronomical quadrant by John Bird

Astronomical quadrant

John Bird

Fine art poster

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Product details Astronomical quadrant

Astronomical quadrant

John Bird

A 12-inch astronomical quadrant made by John Bird. Astronomical quadrants were used to measure the angle of a celestial object from the zenith. Operated in conjunction with a transit instrument, they could be used to check the running rate of astronomical clocks known as regulators. At sea a quadrant can be used to help fix a ship's position and to determine latitude.

ca. 1767

  • Image ref: RS-8472
  • The Royal Society

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