the earth's axis of rotation 地球的旋转轴
The Earth's axis of rotation is tilted in relation to the ecliptic plane, an imaginary surface through Earth's orbit around the sun.
地球的自转轴与黄道面呈一定角度。黄道面是地球公转轨道所在的一个假想平面。
Precession, basically is the change in the direction of earth's axis of rotation.
岁差，基本上是地球自转轴方向的改变。
Of course, with the camera fixed to a tripod, the stars themselves produce concentric trails in long exposures, a reflection of the Earth's rotation around its axis.
当然用装在三角架上的照相机固定摄影，长时间曝光能拍到星星因地球自转而形成的同心圆轨迹。
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