@cicerone imposter,
Quote:I once read many years ago that we go back in time when we cross the international dateline.
When Magellan first circumnavigated the globe he kept very detailed and precise logs. Every time the sun "went down" and then "rose again," a new day was recorded.
When he got back to Spain (or wherever he came from) it turned out that a day was missing from his logs.
According to him, it was, say, January 1, but according to Spanish calendars it was January 2. According to him 644 days had passed since he first left port, but according to the Spaniards, 645 days had passed (those figures are just arbitrary, for the sake of example).
How could this be? Because he himself (but not the Spaniards) actually went all the way around the globe, he saw one less "sunrise" and "sunset." Each day, inch by inch, mile by mile, he was very slowing moving away from the place he saw the sun rise on day 1 (Spain). Put another way, he experienced one less revolution of the earth than a stationary party would have.
He did not "go back in time." Nor did "less time" elapse for him and his crew. He simply came up with a different "measurement" of that time, due to his motion.