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abstraction > mathematical concept > number > quantity > solid angle > isoplanatic patch
Upsolid angle

isoplanatic patch comparison table
Subject is a kind of has definition
solid anglequantityA measure of the angular size of an extended object, equal to the area it subtends on the surface of a sphere of unit radius.
isoplanatic patchsolid angleThe 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.

Upsolid angle