There was a recent show on the Discovery( or maybe History) Channel about GPS time. I guess the satellites are travelling fast enough, that they must take relativistic time dilation into account, or all ground positions would be way off. The satellites are aging more slowly than us on the ground, who are stuck in the muck of earth's gravity.
I'm not really a human, but I play one on earth Remember How Lucky You Are

In reply to Re^4: Converting GPS seconds to readable time&date by zentara
in thread Converting GPS seconds to readable time&date by flamey

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