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Product images of Astronomical quadrant
Product details Astronomical quadrant
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.
- Image ref: RS-8472
- The Royal Society