What usgs stand for and what do they do? The United States Geological Survey/service were and are the cartographers that converted early maps into the GPS location system known today. Edit
Medical Definition of EGOCENTRIC. 1. : limited in outlook or concern to one's own activities or needs.
In astronomy, the geocentric model (also known as geocentrism, or the Ptolemaic system) is a description of the cosmos where Earth is at the orbital center of all celestial bodies.