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Mural Sextant


Mural Sextant (Credit:proantic.com)

The first known mural sextant was built in Ray, Iran by Abu-Mahmud al-Khujandi. A sextant is a sixth of a circle used for measuring the position of stars.

This sextant was a sixty degrees arc with about twenty meters in raduis on a wall align with the north-south line (meridian arc). (Credit:en.wikipedia.org)