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ArcSecond
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"Arc Second" is a unit of angular measure, also called the $\textit{second of arc}$, equal to $1/60 \; arcminute$. One arcsecond is a very small angle: there are 1,296,000 in a circle. The SI recommends $\textit{double prime}$ ($''$) as the symbol for the arcsecond. The symbol has become common in astronomy, where very small angles are stated in milliarcseconds ($mas$).
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0.00000484813681
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4.84813681E-6
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0112/2///62720#UAA096
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http://en.wikipedia.org/wiki/Minute_of_arc#Symbols.2C_abbreviations_and_subdivisions
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https://cdd.iec.ch/cdd/iec62720/iec62720.nsf/Units/0112-2---62720%23UAA096
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"
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''
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″
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D62