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单词 θ1504
释义
the world > the universe > cosmology > science of observation > astronomical instruments > [noun] > astrolabe > astronomer's ring (2)
ring1551

Astronomy. An instrument for measuring the altitude of the sun, consisting of a circle mounted in the plane of the meridian; an armillary circle (cf…

mariner's ring1574

an astrolabe adapted for use at sea.

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更新时间:2024/9/21 13:30:33