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A quadrantIn astronomy, it is an ancient astronomical instrument consisting of a quarter of a metallic circle graduated from 0º to 90º, which was used to measure the height of the stars on the horizon.
From the 18th century, in order to increase the precision of the measurements, instead of supporting the quadrant on a tripod, it was preferred to attach it to a vertical wall oriented in a North-South direction.
This and other similar instruments, sometimes large, were the team of astronomers before the advent of optical astronomy.
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