Octant



[ok-tuh nt] /ˈɒk tənt/

noun
1.
the eighth part of a circle.
2.
Mathematics. any of the eight parts into which three mutually perpendicular planes divide space.
3.
an instrument having an arc of 24°, used by navigators for measuring angles up to 90°.
4.
the position of one heavenly body when 45° distant from another.
5.
(initial capital letter) Astronomy. the constellation Octans.
/ˈɒktənt/
noun
1.
(maths)

2.
(astronomy) the position of a celestial body when it is at an angular distance of 45° from another body
3.
an instrument used for measuring angles, similar to a sextant but having a graduated arc of 45°
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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