地球是内行星中唯一一个有大卫星的，它的轨道既不在地球的赤道平面上，也不在其他行星所在的平面上。
Earth is the only one of the inner planets with a large satellite, the orbit of which is neither in the equatorial plane of Earth nor in the plane in which the other planets lie.
在秋分这一天，地球上赤道正是黄道相交——或者是地球平面轨道环绕太阳，造成我们看到太阳在正西方落下的现象。
And on the day of the equinox, the plane of Earth's equator is intersecting the ecliptic - or plane of Earth's orbit around the sun. So the sun sets due west for all of us.
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