octantn.
英 'ɒkt(ə)nt | 美 'ɑktənt
中文n. [航][水运] 八分仪；[数] 八分圆；成45°视角的位置
词根词源
octant (n.)instrument for making angular measurements in navigation or astronomy, 1731, from Late Latin octans "the eighth part," from octo "eight" (see octa-) on analogy of quadrant. In geometry, octant meant "the eighth part of a circle."
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