近地点

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近地点(Perigee)是一个天文学上的用语,用来指地球卫星在绕地飞行时与地球最近的距离。
地球卫星包括月球以及为数众多的人造卫星。根据天文物理学和数学原理,卫星在绕主星運行时的轨道是一个椭圆。
地球位于椭圆的两个焦点位置中的一个。以椭圆的两个焦点为横轴画一条直线,其与卫星轨道产生两个交点,其中距离地球最近的称为近地点,距离地球最远的称为远地点;通常在近地點時,衛星運行的角速度最快。
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