octant

英 ['ɒkt(ə)nt] 美 ['ɑktənt]
  • n. [航][水运] 八分仪；[数] 八分圆；成45°视角的位置
octant
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英文词源

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."