The 45th meridian west is a line of longitude that is located 45 degrees west of the Prime Meridian. It runs from the North Pole to the South Pole, crossing various countries and regions along the way. This meridian passes through parts of the Atlantic Ocean, the eastern United States, Canada, and Brazil, among others. In general, lines of longitude, including the 45th meridian west, are used in geographic coordinates to specify locations on the Earth's surface.
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