Gregorian telescope

noun

1. a telescope similar in design to the Cassegrainian telescope but less widely used.

Gregorian telescope

noun

1. a form of reflecting astronomical telescope with a concave ellipsoidal secondary mirror and the eyepiece set behind the centre of the parabolic primary mirror

Word History and Origins

Origin of Gregorian telescope¹

1755–65; named after James Gregory; -ian

Word History and Origins

Origin of Gregorian telescope¹

C18: named after J. Gregory (died 1675), Scottish mathematician who invented it