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Chuyên ngành
Oxford
Each of eight parts intowhich three planes intersecting (esp. at right angles) at apoint divide the space or the solid body round it.
Astron. apoint in a body's apparent course 45ø distant from a givenpoint, esp. a point at which the moon is 45ø from conjunction oropposition with the sun.
An instrument in the form of agraduated eighth of a circle, used in astronomy and navigation.[L octans octant- half-quadrant f. octo eight]
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