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PRECESSION, NUTATION, AND WOBBLE OF THE EARTH
assets.cambridge.orgPRECESSION, NUTATION, AND WOBBLE OF THE EARTH Earth rotation has long been used as a measure of time, together with using the stars as reference points, to …
3. 地球の姿勢と自転の変化
www.sci.hokudai.ac.jp歳差 Precession → 天の赤道も運動 春分点γ、50``/年 （東から西） 章動 Nutation → 短周期の多くの移動 歳差・章動＝月、太陽からの潮汐力によるトルクが原因 極運動 Polar motion, Wobble 自転角速度変動→Length of day change (LOD)