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Show International Date Line Does Not Circle the Globe The international date-line does not go all the way around the world. It only goes from the North Pole to the South Pole, following, approximately, ap-proximately, the meridian of 180 degrees longitude. Our ordinary time measurement is based on the Sun, and Noon occurs approximately approxi-mately when that body is in the south. However, when it is directly south here it is not yet in that position po-sition for a place farther west, so when you have noon, it is only 11:00 a. m. at a point 15 degrees of longitude longi-tude to the west. Hence, for each 15 degrees you travel westward, you set your watch back an hour. Going completely around the Earth, from east to west, you would have done this 24 times, and would be a whole day behind the people who had stayed home. |