January 18, 2022 Global Positioning System is, without a doubt, one of the most useful inventions of the late 20th century. It made it significantly easier for ships, airplanes, cars, and hikers to figure out where they are with high degree of accuracy. One of the most exciting aspects of this system are the satellites surrounding Earth. Here’s a current constellation of active satellites, you can drag the view around to see it from different angles: However, the satellites are just a part of wh...