Dawes' limit

noun
\ˈdȯz(ə̇z)-\

Definition of Dawes' limit 

: an approximate value of the resolving power of a telescope based on the theoretical size of the spurious disk being equal in seconds of arc to 4.56 divided by the aperture of the telescope expressed in inches

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History and Etymology for Dawes' limit

after William R. Dawes †1868 English astronomer

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