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地軸

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Precessional movement of Earth. Earth rotates (white arrows) about once a day around its rotational axis (red); this axis itself rotates slowly (white circle), completing a rotation in approximately 26,000 years[1]

地軸の歳差運動地球の回転軸が描く26,000年の巨大なサイクル

歳差運動地軸春分点天文学
2026年8月11日続きを読む →
The celestial equator is currently inclined by about 23.44° to the ecliptic plane. The image shows the relations between Earth's axial tilt (or obliquity), rotation axis, and orbital plane.

天球赤道とは？地球の傾きと星空の座標系を解説

天球赤道天球黄道地軸
2026年8月11日続きを読む →