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

Example Sentences

But in the Gregorian telescope, the image formed by the principal mirror falls on a second mirror, which is very small, slightly curved, and parallel to the first.

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Some recent discoveries in astronomy having arrested his mind, and awakened in him a powerful spirit of curiosity, he sought and obtained from a friend the loan of a two-foot Gregorian telescope. 

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