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Nasireddin couple joft-e Nasireddin Fr.: couple de Nasireddin A theorem put forward by the 13th century Persian mathematician and astronomer
Nasireddin Tusi to generate linear motion from a combination of circular motions, and
thus improve the geocentric model of Ptolemy.
A circle of radius R rotates inside a circle of radius 2R. The smaller circle rotates at
twice the speed of the larger one and in opposite direction. The initial tangent point will travel
in linear motion back and forth along the diameter of the larger circle.
A particular case of → Named for Nasireddin Tusi (1201-1274), director of Marâgha observatory who
created the |