Meaning of Tychonic system

Ty•chon'ic sys"tem

Pronunciation: (tī-kon'ik), [key]
— Astron. Astron.
  1. a 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.