Last Updated
：2025/11/20
celestial sphere
Noun
Japanese Meaning
天球：天文学において、無限の半径を持つ抽象的な球面であり、天体の見かけ上の背景として作用するもの。観測者にとって、地上から見える空がその球面の一半球であるという概念。
（ plural ）
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(astronomy) An abstract sphere of infinite radius which serves as the imaginary backdrop for celestial objects, and of which the visible sky is one hemisphere.
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celestial sphere
When mapping the stars, astronomers often project their positions onto the celestial sphere to simplify measurements.
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When mapping the stars, astronomers often project their positions onto the celestial sphere to simplify measurements.
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