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abstraction > mathematical concept > number > quantity > solid angle

solid angle
subject			fact

solid angle	has definition A measure of the angular size of an extended object, equal to the area it subtends on the surface of a sphere of unit radius.
	is a kind of quantity
quantity	has unit
number	has value

Kinds of solid angle :

• isoplanatic patch (2 facts) - The angular region on the sky over which the wavefront correction applied by an adaptive optics system remains valid. It is relatively small and therefore a nearby reference star is also required.