celestial sphere
(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.
plural of chatoyant
plural of honeylocust
(archaic) obliteration
星図を作成する際、天文学者は測定を簡単にするためにしばしば星の位置を無限の半径を持つ想像上の球面（天球）に投影します。
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