octant

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

Octant \Oc"tant\, noun [L. octans, -antis. fr. octo eight. See {Octave}.]

1. (Geom.) The eighth part of a circle; an arc of 45 degrees.

2. (Astron. & Astrol.) The position or aspect of a heavenly body, as the moon or a planet, when half way between conjunction, or opposition, and quadrature, or distant from another body 45 degrees.

3. An instrument for measuring angles (generally called a {quadrant}), having an arc which measures up to 9O[deg], but being itself the eighth part of a circle. Cf. {Sextant}.

4. (Math. & Crystallog.) One of the eight parts into which a space is divided by three coordinate planes.

From WordNet (r) 3.0 (2006) [wn]:

octant

noun

1: a measuring instrument for measuring angles to a celestial body; similar to a sextant but with 45 degree calibration


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