Gregorian telescope

noun

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

Gregorian telescope

noun

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

Discover More

Word History and Origins

Origin of Gregorian telescope¹

1755–65; named after James Gregory; -ian

Discover More

Word History and Origins

Origin of Gregorian telescope¹

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

Discover More

Example Sentences

Examples have not been reviewed.

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.

From

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.

From

Gregorian mode Gregorian tone

Browse