Astrometric Limit: The maximum residual in the place of a reference star, specified in arc seconds.
天文测量误差极限：参考星位置对应的最大误差，用角秒表示。
The precision of the static orientation is better than 20 arc-seconds, improved by an order of magnitude.
静态定位精度优于20角秒，比改造前的仪器提高了一个数量级。
The precision of the static orientation is better than 20 arc-seconds, improved by an order of magnitude.
静态定位精度优于20角秒，比改造前的仪器提高了一个数量级。
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