地球纬度变化(latitude variation):以恒星为标准来测量地面的纬度时,发现地球上某一点的纬度是在不断变化的,这种现象称为纬度变化。引起纬度变化的主要原因是地极移动,故可以从测量到的全球性纬度变化来推断地极移动;另一个原因是与局部地区地方性因素有关,但还缺乏深入的研究。纬度变化一般不超过半弧秒。
海龟利用地球磁场的变化分辨南北方位,从而指引自己沿正确的纬度迁徙,这对科学家来说并不陌生。
Scientists already knew that the creatures used changes in Earth's magnetic field to help them tell north from south and steer themselves along the right latitude.
海龟利用地球磁场的变化分辨南北方位,从而指引自己沿正确的纬度迁徙,这对科学家来说并不陌生。
Scientists already knew that the creatures used changes in Earth’s magnetic field to help them tell north from south and steer themselves along the right latitude.
地球自转角速度的变化对脉冲星周期变率影响的数值,取决于脉冲星的赤纬和观测台站的纬度;
The magnitude of the effect on the rate of change of pulsar period depends on the declination of the pulsar and the latitude of the observing station.
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