Definition:Colatitude (Terrestrial)

Definition
Let $J$ be a point on Earth's surface that is not one of the two poles $N$ and $S$.

Let $\phi$ denote the latitude of $J$.

The colatitude of $J$ is the (spherical) angle $90 \degrees - \phi$, that is:


 * if $J$ is in the northern hemisphere of Earth, the colatitude is the (spherical) angle $\sphericalangle NOJ$


 * if $J$ is in the southern hemisphere of Earth, the colatitude is the (spherical) angle $\sphericalangle SOJ$.


 * Longitude-Terrestrial.png

Also see

 * Definition:Colatitude (Celestial)