1. Greenwich Meridian — 2020-08-06 08:03:21

   …cks and celestial objects for navigators but it wasn't until **John Harrison** invented his marine chronometer that the longitude at sea was fully mastered. Flamsteed had installed state-of-the-art pendulum clocks by the best clockmaker and set t…
   …class="right" title="Prime Meridian Roof Open" width="" }} == GMT == All clocks around the world are determined by the longitude offset from Greenwich Mean Time. Because the earths crust is always moving so will the imaginary prime meridian so i…

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