diurnal motion

英語（米国） (en-US) 英語（イギリス） (en-GB)

名詞

不可算名詞

(astronomy) The apparent westward rotation of the celestial sphere, along with the apparent westward revolution of celestial objects, around the celestial poles due to prograde (eastward) rotation of planet Earth relative to the seemingly fixed stars – completed once each sidereal day (about 23 hours, 56 minutes, 4 seconds).

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Astronomers track the diurnal motion of stars to align telescopes accurately throughout the night.

詳細

意味（1）

(astronomy) The apparent westward rotation of the celestial sphere, along with the apparent westward revolution of celestial objects, around the celestial poles due to prograde (eastward) rotation of planet Earth relative to the seemingly fixed stars – completed once each sidereal day (about 23 hours, 56 minutes, 4 seconds).