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地球回転角

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A sidereal day is one Earth rotation relative to the stars; a solar day is one Earth rotation relative to the Sun. The Earth rotates about 366 times per 'normal' 365-day year relative to the stars, so Earth's sidereal day is about four minutes shorter than Earth's solar day. (Angle exaggerated for visibility.)

恒星時とは？太陽時との違いと天文学における重要性を解説

恒星時太陽時恒星日太陽日
2026年8月11日続きを読む →