... earth-moon guidance 地月航迹制导 earth-moon line 地月线 earth-moon mass ratio 地球-月球质量比值 ...
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earth moon line 地月线
An eclipse happens when the earth and moon are in line with the sun.
地球和月亮与太阳处在一条直线上，日食就发生了。
During an eclipse, the sun, Earth and moon line up, leaving a darkened moon visible to observers on the night side of the planet.
月全市发生时，太阳，地球和月球连成一线，地球夜晚一侧的观察者可以看到一个变暗了的月亮。
A total lunar eclipse also occurs when the sun, Earth and moon are almost exactly in line, leaving the full moon appear much dimmer than usual.
而太阳、地球和月亮又几乎处于一条线上，月全食出现，导致满月比往常晦暗许多。
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