赤道平面，是指地球赤道所在的平面。卫星轨道所在平面称为轨道平面，轨道平面总是通过地球的中心。轨道平面与地球赤道平面的夹角称为轨道倾角。
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.
工作投影面为赤道平面―相当于地平面。
The working projection plane is taken at the equatorial plane corresponding to the ground surface.
如圆锥(圆柱或平面)轴位于赤道平面内，则成为横轴。
If the axis of the cone (cylinder or plane) lies in the plane of the equator the aspect is transverse.
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