Actually, it is in the name and pretty simple. It is surprisingly called the International Date Line
The international Date Line.
Because when you cross it, you must change your calendar by one day, otherwise you will be out of sync with everyone else in the world.
To change the calendar date when traveling, you must cross the International Date Line, which is located roughly along the 180th meridian in the Pacific Ocean. When you cross this line eastward, you subtract a day, and when you cross it westward, you add a day. This imaginary line helps account for the Earth's rotation and the 24-hour time zones.
The change in the x-coordinates of any two points on a line in the xy-plane is called the "run." In the context of calculating the slope of the line, the run is used along with the change in the y-coordinates (called the "rise") to determine the steepness and direction of the line. The slope is calculated as the ratio of the rise to the run.
the international date line
Midnight.
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Slope. I'm pretty sure.
The 180th meridian is also called the International Date Line because that is where the day changes from one day to the next. Keep in mind that the date change does not follow exactly the 180th meridian and moves slightly east or west as necessary to accommodate the desires of the various countries that lie along it.
the whole world agrees that the date changes on each side of the line
It is along 180 degrees longitude, but it doesn't run in a straight line.
The International Date Line runs roughly along the 180° longitude, (opposite the Prime Meridian), but it is drawn with diversions to pass around some territories and islands.