Last Updated
：2025/11/20
epicycle
IPA(Pronunciation)
Noun
figuratively
Japanese Meaning
天動説において、地球を中心とする運動を説明するために、大きな円の円周上に位置する小さな円として描かれる軌道の一部。 / プトレマイオス天文学で、惑星の運動（「七惑星」など）の基本構造として用いられる概念。
Sense（1）
Sense（2）
（ plural ）
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(astronomy) A small circle whose centre is on the circumference of a larger circle; in Ptolemaic astronomy it was seen as the basis of revolution of the seven planets
, given a fixed central Earth.
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epicycle
The astronomer modeled the planet's motion using an epicycle to account for its apparent retrograde movement.
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The astronomer modeled the planet's motion using an epicycle to account for its apparent retrograde movement.
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