Stonyhurst heliographic coordinates Stonyhurst The origin of the system is at the intersection of the solar equator and the central meridian as seen from Earth. The latitude and longitude are given in degrees, with latitude increasing towards the solar North, and longitude increasing towards the solar West limb. The system can be extended to three dimensions by adding the radial distance from the center of the Sun. 2023-04-18 16:38:00.0 0.1