On New Year's Eve, the new year doesn't begin at the same time for everyone! That's because clocks around the Earth don't all say the same time at the same time. When the sun sets for you at, say, 7 pm, it's still high in the sky for people west of you, so their clocks say 3 or 4 pm. People east of you have nighttime. So each country reaches midnight on New Year's at different times. If you could fly fast enough, you could hit one New Year's party after another!