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
英英释义
- 1. a measuring instrument for measuring angles to a celestial body; similar to a sextant but with 45 degree calibration
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."