arcdegree

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Noun

arcdegree - a measure for arcs and angles; "there are 360 degrees in a circle"

degree

angular unit - a unit of measurement for angles

arcminute, minute of arc, minute - a unit of angular distance equal to a 60th of a degree

oxtant - a unit of angular distance equal to half a quadrant

sextant - a unit of angular distance equal to 60 degrees

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For example, a 400mm f/2.8 attached to a Nikon D100 (also obtainable secondhand for a fraction of its original price) will have a field of approximately 2.3 x 3.4 arcdegrees. At f/2.8 such a lens will capture M31 in less than 60 seconds, producing a result comparable to images once only obtainable on film with large telescopes.