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Tychonic system

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WordReference Random House Unabridged Dictionary of American English © 2026

Ty•chon′ic sys′tem [Astron.]

Astronomya model for planetary motion devised by Tycho Brahe in which the earth is stationary and at the center of the planetary system, the sun and moon revolve around the earth, and the other planets revolve around the sun.

Tychon- (stem of Tycho (Brahe), Latinized form of Danish Tyge) + -ic 1670–80

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