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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Imagine a clock.
Imagine the angle that a hand of that clock would sweeps in a minute. Or a second.
In actual fact an arcminute is 1/60th of a degree, which is 1/360th of a full circle. An arcsecond is 1/60th of an arcminute.
So if you imagined putting a giant clock on the floor, and a clock hand was sweeping across it, the bits that it “points to” during that time are expressed in arcminutes and arcseconds.
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