The Global Positioning System is a common illustration of a practical application of Einstein’s special and general theories of relativity: To remain in sync, ground clocks must operate at 10.23GHz and satellite clocks at 10.22999999543MHz. These numbers were arrived at by using a combination of Einstein’s transformations for special relativity (SR), which accounts for the clocks’ differences in velocity, and general relativity (GR), which accounts for their differences in gravitational potential. As explained in many online resources ... Read even more
