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.
- 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.
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