Among the Arabs and Persians were great calculators and mathematicians who worked to improve the cos

Among the Arabs and Persians were great calculators and mathematicians who worked to improve the cos

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Among the Arabs and Persians were great calculators and mathematicians who worked to improve the  cosmological explanation of astronomical measurements. For example, Nasir al-din al-Tusi at Maragha  produced a particularly innovative addition to Ptolemy's circular motions. The "Tusi couple" calculates a  linear motion from a combination of uniform circular motions. In his revolutionary work on the solar  system published in 1543, Copernicus used a strikingly similar device. Also, Copernicus used a model for  the Moon's motion identical to one devised two centuries earlier by the astronomer Ibn al-Shatir in  Damascus. Copernicus cited the works of Islamic astronomers and certainly learned from them. Historians  are still trying to determine the full extent of his intellectual debt. Revolutions in science
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