Gregorian telescope


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Gregorian telescope

n
(Astronomy) 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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Noun1.Gregorian telescope - a reflecting telescope that has a paraboloidal primary mirror and a hyperboloidal secondary mirrorGregorian telescope - a reflecting telescope that has a paraboloidal primary mirror and a hyperboloidal secondary mirror; light is brought to a focus through an aperture in the center of the primary mirror
reflecting telescope, reflector - optical telescope consisting of a large concave mirror that produces an image that is magnified by the eyepiece; "Isaac Newton invented the reflecting telescope in 1668"
References in periodicals archive ?
Before this, the far less well-known Scots astronomer and mathematician James Gregory designed a reflecting telescope which is now known as a Gregorian telescope.
Readers wishing to learn more about Victor's experiences building a Gregorian telescope can reach him at bvip1@verizon.
The result is a Compact Gregorian Telescope that can be as short as 1/7th the focal length of the system.