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Updated: May 10, 2025
The appearance of the new star in 1572 led him to form a catalogue of 777 stars, vastly superior in accuracy to those of Hipparchus and Ulugh Beig. His improvements on the lunar theory were still more valuable. He discovered the important inequality called the variation, and also the annual inequality which depends on the position of the earth in its orbit.
Don J. A. Conde says "Fes or sea Fez, the capital of the realm of that name; the fables of its origin, and the grandeur of the Moors, who always speak of their cities as foundations of heroes, or lords of the whole world, &c., a foible of which our historians are guilty. Nasir-Eddin and the same Ullug Beig say, for certain, that Fez is the court of the king in the west.
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