nutation
柯林斯词典
1. N a periodic variation in the precession of the earth's axis causing the earth's poles to oscillate about their mean position (造成地球磁極在其平均位置的周圍擺動的)地球軸線運動的周期性變化[astronomy]
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1. N a periodic variation in the precession of the earth's axis causing the earth's poles to oscillate about their mean position (造成地球磁極在其平均位置的周圍擺動的)地球軸線運動的周期性變化[astronomy]