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大家都知道月球是绕地球旋转的卫星,本身不发光,月光是月球反射的太阳光。我们在地球上看月亮,看到的是月球被太阳照亮的那部分,有时看到的多一些,有时看到的少一些,见图1。我们在地球上看到月亮在天空中的运动,是地球自转和月球绕地球公转两种运动的合成。这两种运动可以分解为:1.周日运动,就是月亮自东向西的运动(一天一周期,对应地球自转)。2.周月运动,就是月亮自西向东的运动(一月一周期,对
As we all know, the moon is a satellite rotating around the Earth. It itself does not emit light, and the moon is the sunlight reflected by the moon. We look at the moon on Earth and see the part of the moon illuminated by the sun, sometimes seeing more and sometimes less, as shown in Figure 1. We see on Earth the movement of the moon in the sky, the synthesis of two kinds of movements, the earth’s rotation and the moon’s revolution around the earth. The two movements can be decomposed into: 1. Sunday movement, is the moon from east to west movement (one day cycle, corresponding to the Earth’s rotation). 2. Zhouyue exercise, is the movement of the moon from west to east (January cycle, right