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Armillary Sphere


Armillary Sphere (Credit:collections.rmg.co.uk)

Probably the first modern observatory was built by Arabic astronomers in Shamsiya, near Baghdad and at Mount Qasiyun, near Damascus. In Shamsiya, a building was built for accomodation and work place for astronomers.

The one of the instruments used for observation was armillary sphere. It is a spherical globe with rings and hoops depicting equator, tropics and other celestial circles. It can move on its axis. (Credit:en.wikipedia.org)