Istanbul - Museum of the History of Islamic Science and Technology

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TK2714Erol.jpg
Instruments with two beams replica (ca 1265) at the Museum of the History of Islamic Science and Technology, Istanbul, Turkey. Model of a device from the Maraga observatory invented by Mu'aiyad addin al-'Urdi. Used for the determination of culmination attitudes in combination with a mural quadrant. Made after the description and illustration contained in the observatory's book