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What is the International Date Line

  • A.It is the Equator
  • B.It is the 0° Longitude
  • C.It is the 90° Longitude
  • D.It is the 180° Longitude

Answer: D

The International Date Line is the 180° Longitude.

It runs roughly along the 180° meridian, halfway round the world from Greenwich, through the Pacific Ocean. Crossing it eastward a traveller sets the calendar back one day; crossing it westward, forward one day. The line zigzags away from 180° in places to avoid splitting island groups and countries.

The Equator is the 0° parallel of latitude, not a longitude. The 0° meridian is the Prime Meridian through Greenwich, which sets standard time, not the date. The 90° meridians have no such role.

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