秒びょう角かく

noun

arcsecond; second of arc

Unit of angular measurement equal to 1/3600 of a degree. Used in astronomy, geodesy, and optics.

• この望ぼう遠えん鏡きょうの分解能かいぞうのうは0.1秒びょう角かくです。

  The resolution of this telescope is 0.1 arcseconds.