Gregorian telescope

Definition of Gregorian telescope

(Opt.) a form of reflecting telescope, named from Prof. James Gregory, of Edinburgh, who perfected it in 1663. A small concave mirror in the axis of this telescope, having its focus coincident with that of the large reflector, transmits the light received from the latter back through a hole in its center to the eyepiece placed behind it.
a form of reflecting telescope. See under Gregorian.

See also: Gregorian Telescope

Related Words

Cassegrainian telescope, reflecting telescope, reflector
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