Hi, On 14-10-2011 21:04, Stephen A. Lawrence wrote:
The point is they're using a time value which is "universal". An observer hanging in space, stationary, directly over the pole, looking down at GPS receivers all over the Earth would see that, at a given moment, they /all showed the same time/ (modulo time zone changes).
True, but as a matter of fact there is currently only one manned space station, i.e. the ISS (international Space Station), which does not hang around in a single place around earth and certainly not above the North or South pole; it actually rotates between approx. 50 N and S in 1.5 hours around the earth. I'm not sure if it is even physically feasible to let it hang without any movement above one of the poles.
See also http://spaceflight.nasa.gov/realdata/sightings/ to locate where it passes.
Kind regards, MoB
