Gregorian telescope (redirected from Gregorian telescopes)

Gregorian telescope

n

(Astronomy) a form of reflecting astronomical telescope with a concave ellipsoidal secondary mirror and the eyepiece set behind the centre of the parabolic primary mirror

[named after J. Gregory (died 1675), Scottish mathematician who invented it]

Thesaurus

Noun

1.

Gregorian telescope - a reflecting telescope that has a paraboloidal primary mirror and a hyperboloidal secondary mirror; light is brought to a focus through an aperture in the center of the primary mirror Cassegrainian telescope reflecting telescope, reflector - optical telescope consisting of a large concave mirror that produces an image that is magnified by the eyepiece; "Isaac Newton invented the reflecting telescope in 1668"