coordinate system spherical coordinate system Orlaith Burke Alejandra Gonzalez-Beltran In mathematics, a spherical coordinate system is a coordinate system for three-dimensional space where the position of a point is specified by three numbers: the radial distance of that point from a fixed origin, its polar angle measured from a fixed zenith direction, and the azimuth angle of its orthogonal projection on a reference plane that passes through the origin and is orthogonal to the zenith, measured from a fixed reference direction on that plane. Philippe Rocca-Serra https://en.wikipedia.org/wiki/Spherical_coordinate_system placeholder removed