There’s a very good reason not to consider longitude vs. latitude as a degree of freedom. Latitude is measured from the Equator, which is objectively defined by the motion of the Earth. But longitude is measured from the Greenwich meridian, which was defined by nothing more than where the creators of the coordinate system were located.
There’s a very good reason not to consider longitude vs. latitude as a degree of freedom. Latitude is measured from the Equator, which is objectively defined by the motion of the Earth. But longitude is measured from the Greenwich meridian, which was defined by nothing more than where the creators of the coordinate system were located.