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    unit:ARCSEC
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    http://qudt.org/vocab/unit/ARCSEC

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    lang:en
    ArcSecond
    lang:""
    "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 (\(mas\)).
    lang:""
    0.00000484813681
    lang:""
    0112/2///62720#UAA096
    lang:""
    http://en.wikipedia.org/wiki/Minute_of_arc#Symbols.2C_abbreviations_and_subdivisions