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.
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Origin of spherical coordinate
First recorded in 1860–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Science definitions for 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.