The polar angle on a sphere measured from the north pole instead of the equator. The angle 
in spherical coordinates
is the colatitude. It is related to the latitude 
by 
.
Colatitude
See also
Latitude, Longitude, Polar Angle, Spherical Coordinates, Zenith AngleExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Colatitude." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Colatitude.html