Ptolemaic system
(亦作Ptolemaic theory)
noun
- Astronomy, historical the theory that the earth is the stationary centre of the universe, with the planets moving in epicyclic orbits within surrounding concentric spheres【天文】〈史〉托勒密（宇宙）体系, 天动说（地球为宇宙静止中心, 行星在周围同心天体之中的本轮轨道上运行）。比较COPERNICAN SYSTEM.