Astronomical quadrant Product:Fine art poster by Sydney Parkinson (London

by Sydney Parkinson (London

This picture depicts an event from the Old Testament

held for him at the end of May 1858

Front view of buildings on Aldersgate Street

View of Powis House

Astronomical quadrant Product:Fine art poster by Sydney Parkinson (LondonA 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