I can never get my head around these units of measure. Often referenced in terms of resolution of the eye or a telescope. What the hell is an arcsecond?
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From math class you probably know that a circle is split up in to 360 ‘degrees’.
Well if we want to measure smaller angles, we split each degree in to 60 ‘arcminutes’.
And for ever smaller angles we split each arcminute in to 60 ‘arcseconds’.
So there are 60 arcseconds in an arcminute. 60 arcminutes in a degree, and 360 degrees in a circle.
The same way we split hours of time in to minutes and seconds, we split degrees of angle in to arcminutes and arcseconds.
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