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Epicyclic planetary model in a medieval manuscript by Qutb al-Din al-Shirazi.
Epicyclic planetary model in a medieval manuscript by Qutb al-Din al-Shirazi.
a manuscript copy of Shirazi's al-Tuhfa al-Shahiya, 15th century
a manuscript copy of Shirazi's al-Tuhfa al-Shahiya, 15th century
Shirazi's Tomb in Tabriz, Charandab
Shirazi's Tomb in Tabriz, Charandab
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18th century Persian brass astrolabe at the Whipple Museum of the History of Science in Cambridge, England. The astrolabe consists of a disk engraved
18th century Persian brass astrolabe at the Whipple Museum of the History of Science in Cambridge, England. The astrolabe consists of a disk engraved with the positions of the celestial bodies.
The Tusi-couple is a mathematical device invented by Nasir al-Din al-Tusi in which a small circle rotates inside a larger circle twice the diameter of
The Tusi-couple is a mathematical device invented by Nasir al-Din al-Tusi in which a small circle rotates inside a larger circle twice the diameter of the smaller circle. Rotations of the circles cause a point on the circumference of the smaller circle to oscillate back and forth in linear motion along a diameter of the larger circle.
An illustration from al-Biruni's astronomical works that explains the different phases of the moon, with respect to the position of the sun.
An illustration from al-Biruni's astronomical works that explains the different phases of the moon, with respect to the position of the sun.
Ibn al-Shatir's model for the appearances of Mercury, showing the multiplication of epicycles using the Tusi-couple, thus eliminating the Ptolemaic ec
Ibn al-Shatir's model for the appearances of Mercury, showing the multiplication of epicycles using the Tusi-couple, thus eliminating the Ptolemaic eccentrics and equant.