Dawes limit is an empirical formula derived by the English amateur astronomer William Dawes (1799–1868) that gives the smallest angular separation of two stars in which each is still observable with a telescope of given aperture. The Dawes limit in arcseconds is 11.6/D, where D is the aperture of the telescope in centimeters.
Related entries Rayleigh criterion
Related category OPTICS AND OPTICAL PHENOMENA
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