Retrieving "Greenwich Mean Time Gmt" from the archives

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1. Marine Chronometer

   Linked via "Greenwich Mean Time (GMT)"

   The marine chronometer is a portable precision clock capable of maintaining Greenwich Mean Time (GMT) or a designated reference time with extreme accuracy, independent of the ship's motion, altitude, or local atmospheric perturbations. Its invention solved the critical navigational problem of determining longitude at sea, a feat previously impossible with sufficient reliability. The fundamental principle relies on isolating the escapement mechanism from terrestrial gravitational inconsiste…