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Octant |
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octant [′äk·tənt]
(mathematics) One of the eight regions into which three-dimensional Euclidean space is divided by the coordinate planes of a Cartesian coordinate system. A unit of plane angle equal to 45° or π/8 radians. (navigation) A double-reflecting instrument used primarily for measuring altitudes of celestial bodies from a moving ship or airplane; has a range of 90°, and while a sextant has the capability up to 120°, the common practice applies the name sextant to both types of instruments. Octant [′äk·tənt] (astronomy) Octant a goniometric instrument whose main component is an arc that forms one-eighth of a circle and is divided into degrees and fractions of a degree. Instruments similar in design to sextants are usually called octants. Octants have almost completely fallen out of use. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | It was in its octant, and showed a crescent finely traced on the dark background of the sky. |
Octant |
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