An early reflecting telescope in which light reflected from a concave elliptical secondary mirror passes through a hole in the primary mirror. It was rendered obsolete by the introduction of Newtonian and Cassegrain telescopes.
More example sentences
- Therefore, for certain applications, Gregorian telescopes have desirable advantages over other telescope designs.
- There are two different classes of two-mirror telescopes: Cassegrain telescopes and Gregorian telescopes.
- He subsequently became the most successful London manufacturer of Gregorian telescopes, which were named after their original inventor.
mid 18th century: named after James Gregory (1638–75), the Scottish mathematician who invented it.
Definition of Gregorian telescope in:
- The US English dictionary