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A quadrant is an instrument that is used to measure angles up to 90°. Different versions of this instrument could be used to calculate various readings, such as longitude, latitude, and time of day. It was originally proposed by Ptolemy as a better kind of astrolabe. Several different variations of the instrument were later produced by medieval Muslim astronomers.Mural quadrants were important astronomical instruments in the 18th century European observatories, establishing a use for positional astronomy.

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  • Quadrant (instrument)
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  • A quadrant is an instrument that is used to measure angles up to 90°. Different versions of this instrument could be used to calculate various readings, such as longitude, latitude, and time of day. It was originally proposed by Ptolemy as a better kind of astrolabe. Several different variations of the instrument were later produced by medieval Muslim astronomers.Mural quadrants were important astronomical instruments in the 18th century European observatories, establishing a use for positional astronomy.
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