黄道平面是一个假想的平面，理论上它包含了地球环绕太阳运行的轨道。
The ecliptic plane is defined as the imaginary plane containing the Earth's orbit around the sun.
地球绕一个贯穿南极点和北极点的假想轴旋转，这个假想轴称为地轴。 同时也绕太阳公转。
The Earth spins on an imaginary line called an axis that runs from the north pole to the south pole, while also orbiting the sun.
三月春分发生的那一刻，太阳越过天球赤道 - 假想一条线在地球赤道上方的天空 – 贯穿南北。
The March equinox occurs the moment the sun crosses the celestial equator – the imaginary line in the sky above the Earth's equator – from south to north.
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