The 155th meridian west is a line of longitude that is 155 degrees west of the Prime Meridian, which is the line of longitude defined as 0 degrees. The meridian is used in geographic coordinate systems to help specify locations on the Earth's surface. Geographically, the 155th meridian west passes primarily through the Pacific Ocean and also intersects a few territories. For example, it passes through parts of the Aleutian Islands in Alaska as it heads north.
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