单词 | Gregorian telescope |
释义 | Gregorian telescope/ɡrɪˈɡɔːrɪən /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.Therefore, for certain applications, Gregorian telescopes have desirable advantages over other telescope designs....
OriginMid 18th century: named after James Gregory (1638–75), the Scottish mathematician who invented it. |
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