Global Positioning System technology, or GPS, uses satellites in space. The satellites are fitted with accurate clocks, which have their own particular way of counting time, known as GPS time.
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- The seconds that pass in a week are counted from 00:00 midnight every Sunday. There are 604,800 seconds in a week. GPS time is counted in seconds and weeks, but not days, hours or minutes. Scientists set the start time of satellite clocks as midnight on Sunday January 6, 1980.
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- Every week is given a number. Week 0 was January 6-12, 1980. Every 1,024 weekd, which is about 20 years, the week number resets back to 0.
