gregorian-telescope

Gregorian telescope

noun
a telescope similar in design to the Cassegrainian telescope but less widely used.

Origin:
1755–65; named after James Gregory; see -ian

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World English Dictionary
Gregorian telescope
 
n
a form of reflecting astronomical telescope with a concave ellipsoidal secondary mirror and the eyepiece set behind the centre of the parabolic primary mirror
 
[C18: named after J. Gregory (died 1675), Scottish mathematician who invented it]

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