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| abstraction > mathematical concept > number > quantity > solid angle > isoplanatic patch |
| isoplanatic patch comparison table | ||
| Subject | is a kind of | has definition |
|---|---|---|
| solid angle | quantity | 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. |
| isoplanatic patch | solid angle | 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. |
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