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单词 视差
释义 〔parsec〕A unit of astronomical length based on the distance from Earth at which stellar parallax is one second of arc and equal to 3.258 light-years, 3.086×1013 kilometers, or 1.918 × 10 13 miles. 秒差距:天文学自地球起的距离单位,星视差为1角秒,等于3.258光年,3.086×1013公里,或1.918×10 13英里 〔Bessel〕Prussian astronomer who recalculated the orbit of Halley's comet (1804), verified by parallax the distance from the earth to the twin star 61 Cygni (1838), and developed a class of mathematical functions based on his study of planetary perturbation.贝塞耳,弗雷德里希·威廉:(1784-1846) 普鲁士天文学家,重新测量了哈雷彗星轨道(1804年),通过视差核实地球到双子星座61──天鹅星座的距离(1838年),在其行星摄动研究的基础上发展了一种数学函数
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