If you ever get to go to London... https://www.rmg.co.uk/stories/clocks-timekeeping https://www.rmg.co.uk/stories/clocks-timekeeping Latitude has a "natural" d

If you ever get to go to London... https://www.rmg.co.uk/stories/clocks-timekeeping https://www.rmg.co.uk/stories/clocks-timekeeping Latitude has a "natural" definition (sphere spins around, how big around are you spinning near the poles vs. the equator?). Longitude has no "natural" definition!? How far away are you from Mount Everest? ...only works when you have a natural sight line to the peak of the mountain... If "high noon" at London is exactly (ummm...) NOW! ...and you go 1000 miles west, how much TIME has passed between your "noon" and London's "noon"? You need a good watch... and how can you determine "high noon" on the pitching deck of a ship at sea? ...maybe not with your typical pendulum clock! It was such a mind-blowing experience to learn that maps (and thus CLOCKS!) were first a military and trade technology! If you have a good clock, you can get a good X-coord in addition to the "free" Y-coord. If you can get good X,Y then you can make a good map. If you have a good map, you can optimize your trade / military routes, etc, etc, etc. Highly worth going a bit out of the way for a visit, was actually one of the highlights of the trip for me.