noun
geocentric theory; Ptolemaic theory
Refers to the pre-Copernican astronomical model where the Earth is the center of the universe. Often contrasted with 地動説 (heliocentric theory).
See also: 地動説
天動説は長い間、西洋の天文学の中心だった。
The geocentric theory was central to Western astronomy for a long time.
コペルニクスが地動説を唱えるまで、天動説が信じられていた。
Until Copernicus proposed the heliocentric theory, the geocentric model was believed.