角秒,又称弧秒,是量度角度的单位,即角分的六十分之一,符号为"。在不会引起混淆时,可简称作秒。“角秒”二字只限用于描述角度,不能于其他以“秒”作单位的情况使用(如时间)。
星间的视角距离(Apparent angular separation)是用角秒(Second of arc)来量的。如所分辨的两颗同星等(即同样亮度)的星其视角距离为θ,望远镜之直径为D,则
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... 角鉴别率 angular resolution 角秒 angular second 角灵敏度 angular sensitivity ...
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微角秒天体测量 micro-arcsec astrometry
亚毫角秒光波天体测量 submilliarcsecond optical astrometry
等每平方角秒 magnitude per arc second square
角百分制秒 centesimal second of angle
纳秒三角波脉冲 Nanosecond triangle waveform pulse
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.
指出中期异常的特征是破坏年变化规律,异常时间在半年以上,幅度可达几个角秒。
The medium-range tilt anomaly was characterized by the violation of the regularity of annual variation. The magnitude of the anomaly may amount to a few seconds and lasted for about half a year.
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)。
It is the ability to separate two closely-spaced stars into two distinct images measured in seconds of arc.
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