Concept information
There is no term for this concept in this language
优选词，正式主题词
0112/2///62720#UAA096ArcSecond (en)
定义
- "Arc Second" is a unit of angular measure, also called the $\ extit{second of arc}$, equal to $1/60 \\; arcminute$. One arcsecond is a very small angle: there are 1,296,000 in a circle. The SI recommends $\ extit{double prime}$ ($''$) as the symbol for the arcsecond. The symbol has become common in astronomy, where very small angles are stated in milliarcseconds ($mas$).
上位概念
其它语言
-
英语
URI
https://vocab.sentier.dev/units/unit/ARCSEC
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