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单词 Gregorian telescope
释义

Gregorian telescope

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.
格雷果里反射式望远镜。
词源
mid 18th cent.: named after James Gregory (1638-75), the Scottish mathematician who invented it.
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更新时间:2025/3/19 12:15:42