Last Updated：2025/11/28

(astronomy) A geocentric model of the solar system, described by the eponymous astronomer.

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Ptolemaic system

Source Word

Ptolemaic system

Proper noun

(astronomy) A geocentric model of the solar system, described by the eponymous astronomer.

Japanese Meaning

プトレマイオスによって記述された、地球中心の太陽系モデル（天動説）。

Although the Ptolemaic system explained planetary motion for centuries, observations eventually showed its inaccuracies.

プトレマイオスの天動説は何世紀にもわたって惑星の運動を説明したが、観測が進むとその不正確さが明らかになった。

Sense（1）

(astronomy) A geocentric model of the solar system, described by the eponymous astronomer.

The theories in your books are almost as obsolete as the Ptolemaic System.