Time zones. Only part of the Earth is facing the sun at any point in time. When the sun is rising in one part of the world, it is setting in another.
If you start in New Zealand at sunrise and call it Monday, and follow that sunrise all throughout the world, all the way to Hawaii, you will have Monday throughout the world, but then only a few hours later it will be sunrise again in New Zealand, so it must now be Tuesday, but it’s still Monday morning in Hawaii.
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