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The Prime Meridian is located at 0 degrees, the international date line is not. There is only one prime meridian, there are many international date line.
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180 of them.
No. Greenwich Mean Time is the timezone located along the Prime Meridian, 0º longitude. The International Date Line is on the exact opposite side of the earth at 180º, with some variance. The International Date Line is 12 hours away from Greenwich Mean Time in many areas.
Although the line at 180° passes right through Fiji, the International Date Line at that latitude is relocated to the east sides of Western Samoa and Tonga. I don't know how many miles that is, but it's at least 6° of longitude east of 180°. (Western Samoa relocated the International Date Line to its east side in December, 2011, less than seven months before the time of this writing.)
the international date line is 0 degrees
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Most of it is at 180 degrees.
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The Prime Meridian is located at 0 degrees, the international date line is not. There is only one prime meridian, there are many international date line.
10,000 national & international.
A linear line is one that is straight with no curves. A non-linear line would not be perfectly straight and can have many curves.
24 Hours. When you pass the international date line which is the meridian of 180 longitude, you add a day if going west or subtract a day going east.
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180 degrees