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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....
  • 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.

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更新时间:2024/12/23 0:02:04