专业释义英英释义
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拱(极)点：lower (或 higher) apsis月球或行星等轨道上离引力中心最近(或最远)的一点拱点
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(尤指教堂东端凸出的)半圆形(或多角形)拱顶附带建筑(或后殿)；半圆壁龛
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拱点远近点
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柯林斯英汉双解大词典
apsis /ˈæpsɪs/
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1.
N either of two points lying at the extremities of an eccentric orbit of a planet, satellite, etc, such as the aphelion and perihelion of a planet or the apogee and perigee of the moon. The line of apsides connects two such points and is the principal axis of the orbit 拱点 (Also called apse)
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