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If not for standard time zones, the midnight line would be the longitude directly opposite the longitude on which the sun is directly overhead. Therefore, it would be constantly circling the earth. At the moment when the sun is at its highest point in the sky as seen from Greenwich, England (noon GMT), the midnight line would coincide with the international date line. That would be the one moment per day in which local time at every point around the earth would be on the same day.

In reality, the midnight line jumps from one time zone boundary to the next through the day. When it is midnight where you are, the midnight line is jumping from the first time zone boundary east of you to the first time zone boundary west of you. Since Sunday becomes Monday when the midnight line "travels" past you to the west, the same is true when you travel past the midnight line to the east. However, when you travel east across the international date line, Monday becomes Sunday.

If the international date line were the 12 at the top of a clockface, the midnight line would be the hour hand.

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