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octant是什么意思

octant

美['ɒktənt]  英['ɒktənt]
n.  八分圆;八分仪;离角45度的位置
  形容词:octantal

英英释义

Noun
  1. a measuring instrument for measuring angles to a celestial body; similar to a sextant but with 45 degree calibration
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