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mural circle


'mural circle' can also refer to...

 

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An instrument used before the invention of the telescope to measure the angle above the horizon of astronomical objects as they crossed the meridian. It consisted of a large arc engraved with an angular scale, mounted vertically on a north–south wall. If the arc covered 90 ° (a quarter-circle) it was known as a mural quadrant. A sighting device allowed the altitude above the horizon of a chosen star to be measured.

Subjects: Astronomy and Astrophysics.


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