What did Tusi update in astronomy?
Planetary model
Star charts
Lunar calendar
Solar calendar
Answer
Planetary model: Tusi updated the planetary model by introducing the Tusi couple, a geometric mechanism that replaced the equant in the Ptolemaic model. The Tusi couple allowed for a more accurate representation of planetary motion, eliminating the need for the equant, which was a mathematical device used to explain the non-uniform motion of planets.
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