Share this entry

Share this page

Gregorian telescope

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

Definition of Gregorian telescope in English:

noun

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.
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.

Origin

mid 18th century: named after James Gregory (1638–75), the Scottish mathematician who invented it.

Definition of Gregorian telescope in:

Share this entry

Share this page

 

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Get more from Oxford Dictionaries

Subscribe to remove ads and access premium resources

Word of the day tenebrous
Pronunciation: ˈtenəbrəs
adjective
dark; shadowy or obscure