The idea is that if polar alignment is off, the stars in the photo will show a line.
作用是对极轴不准时，星会在照片中呈现一条线（拉线）；
The alignment of the polar axis and the monitoring of the guiding process require absolute accuracy.
极轴的摆放及追踪过程必须十分准确。
The alignment of the polar axis and the monitoring of the guiding process require absolute accuracy.
极轴的摆放及追踪过程必须十分准确。
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