[SOLVED] GPS and Special relativity (Graph) 1. The problem statement, all variables and given/known data The image attached is a graph I'm supposed to be able to figure out. I'm supposed to be able to figure out the distance between a Satelite and a GPS reciever. X axis: Time / seconds Y axis: Signal strength / no unit There is no legend to the graph, so I don't know which curve represents the satellite and which represents the reciever. 2. Relevant equations Don't Know 3. The attempt at a solution I simply don't know what to do? I've messed around with this graph for the last 2 days and it's the last thing I need done in my project on Special relativity and GPS. PS: Sorry for the double post, but need this done by today and haven't gotten an answer in the thread in the SR / GR forums yet for some time.