dawes' limit

dawes' limit
\\ˈdȯz(ə̇z)-\ noun
Usage: usually capitalized D
Etymology: after William R. Dawes died 1868 English astronomer
: 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

Useful english dictionary. 2012.

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