That is how we invented GPS...

cpa an hour ago | parent | next [-]

And without relativity theory positioning error would be measured in kilometers.

	▲	creata 32 minutes ago \| parent [-]
		I've always wondered - if special and general relativity weren't known, could the GPS engineers have just measured the error and empirically accounted for it? I don't know relativity or GPS or engineering well enough to answer.

robotpepi an hour ago | parent | prev [-]

doesn't it use special relativity or some modern physics?