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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A circle can be divided into 360 wedges, which we call degrees.
Each degree in turn can be divided into 60 arcminutes, and each arcminute can in turn be divided into 60 arcseconds.
An arcminute is basically 1/60th of a degree.
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