epicycle

IPA(Pronunciation)

/ˈɛpɪˌsaɪkəl/

Noun

figuratively

(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.

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。

What is this buttons?

The astronomer modeled the planet's motion using an epicycle to account for its apparent retrograde movement.

Google Translation / DeepL Translation

天文学者は、惑星の見かけの逆行を説明するために、大きな円の円周上に中心を持つ小さな円を用いてその運動をモデル化した。

Details

Sense（1）

(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.

, Folio Society, 2006, vol.1, p.155:

Google Translation / DeepL Translation

Details

Sense（2）

(mathematics) Any circle whose circumference rolls around that of another circle, thus creating a hypocycloid or epicycloid.

Sense（3）

(organic chemistry) A ring of atoms joining parts of an already cyclic compound

Sense（4）

(figuratively) An ad hoc complication added to a model to make it fit the known data

Details

epicycles

（ plural ）

Details

epicycle

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