What is a geographic coordinate system

The Geographic Coordinate System (GCS) is a system in which every single location on earth can be represented using a numerical identity based on the directions and intersections of longitude and latitude at that particular location.

Explanation:

The system of locating points on the surface of Earth using coordinates was invented by Eratosthenes around 2300 years ago. The modern-day Geographic Coordinate System is capable of locating points at distances that are only a second apart from each other.The Equator (0° latitude) and the Prime Meridian (0° longitude) serve as the reference points for this system.

Geothermic gradient is the rate of increasing temperature with respect to increasing the depth in the earths interior. away from tech tonic plates boundaries, it is about 25-40 c/km (72-87 degrees f/mi) of depth near the surface in most of the world.