It is the ability to separate two closely-spaced stars into two distinct images measured in seconds of arc.
也就是能够分开两个距离很近的两颗星的能力，单位是角秒1(seconds of arc)。
Visible light telescopes can resolve a piece of sky just a few arc seconds across — at least 60 times a smaller patch of sky than can be resolved with the human eye.
光学望远镜在数角秒内就能获取一张星空图—至少比肉眼能获取的大60倍。
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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