Gregorian Telescope

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Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke4717.&link_type=abstract

"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 4717. Bristol: Institute of Physics Publishing, 2001

Astronomy and Astrophysics

Astronomy

History And Archaeoastronomy, History Of Astronomy

Scientific paper

A type of reflecting telescope originally designed in 1663 by the Scottish mathematician, James Gregory. It utilizes a concave paraboloidal primary mirror and a concave ellipsoidal secondary mirror that is located outside the focus of the primary. Light reflected from the secondary travels back down the telescope tube, through a central hole in the primary, to the eyepiece. Because the secondary ...

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