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spherical coordinate

noun, Mathematics.
Usually, spherical coordinates. any of three coordinates used to locate a point in space by the length of its radius vector and the angles this vector makes with two perpendicular polar planes.
Origin of spherical coordinate
1860-65 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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spherical-coordinate in Science
spherical coordinate  
Any of a set of coordinates in a three-dimensional system for locating points in space by means of a radius vector and two angles measured from the center of a sphere with respect to two arbitrary, fixed, perpendicular directions.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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