The coordinate systems are implemented in either spherical …
The coordinate systems are implemented in either spherical or rectangular coordinates. Spherical coordinates, projected on the celestial sphere, are analogous to the geographic coordinate system used on the surface of Earth.
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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:
1. The radial distance of that point from a fixed origin
2. Its polar angle measured from a fixed zenith direction
3. The azimuthal 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.