Last Updated：2025/11/27

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(astronomy) An idealised conception of the celestial sphere in which the celestial equator is perpendicular to the local horizon and the Sun reaches the zenith at its highest point.

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sphaera recta

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Source Word

sphaera recta

IPA(Pronunciation)

/ˈsfiːɹə ˈɹɛktə/

Noun

singular singular-only

(astronomy) An idealised conception of the celestial sphere in which the celestial equator is perpendicular to the local horizon and the Sun reaches the zenith at its highest point.

Japanese Meaning

天体の理想化された天球の概念。観測地点において、天の赤道が地平線に対して垂直になり、太陽が最高点で天頂に達するという理論的なモデル。

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Observers used the sphaera recta model to predict when the Sun would pass directly overhead at their latitude.

Google Translation / DeepL Translation

観測者たちは、太陽が自分たちの緯度で真上を通過する時期を予測するために、直立した天球モデルを用いた。

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Sense（1）

(astronomy) An idealised conception of the celestial sphere in which the celestial equator is perpendicular to the local horizon and the Sun reaches the zenith at its highest point.

There is a certain region lying to the south of us which is said to be under the equator, where the poles fall on the horizon, and the sphere of the universe stands straight up, as it were (sphaera recta).

Google Translation / DeepL Translation

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sphaera recta

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