Definition of Gregorian telescope in English:

Gregorian telescope

Line breaks: Gre¦gor|ian tele|scope
Pronunciation: /grɪˈgɔːrɪən


  • 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.

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a slit made by cutting with a saw