Definition of Gregorian telescope in English:

Gregorian telescope

Syllabification: Gre·go·ri·an tel·e·scope


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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