The Great Circle Distance is the shortest distance between two points on the surface of a sphere, such as the Earth. This distance is measured along the surface of the sphere, following a path that forms a circle whose center coincides with the center of the sphere. It is commonly used in navigation and aviation to determine the most efficient route between locations. To calculate the Great Circle Distance, one can use the Haversine formula, which takes into account the latitude and longitude of the two points. This method is essential for pilots and sailors, as it helps them save time and fuel by finding the quickest path across the globe.