The thing that really freaked them out was when they saw that sailing around the world threw the ship’s calendar off by one day.
They quickly figured out the puzzle and started using chronometers in ships.
Never thought about that but if course it’s true...makes it a little tricky to keep a ship’s log or for someone reading it later to be sure of the “when” part.
Not until they created accurate clocks that would work on a ship. check out Longitude movie or series.
https://www.imdb.com/title/tt0192263/
Great book. Fast read.