Longitude is the measurement east or west of the prime meridian. Longitude is measured by imaginary lines that run around the earth vertically (up and down) and meet at the north and south poles. These lines are known as meridians. Each meridian measures one arcdegree of longitude. The distance around the earth measures 360 degrees.
the meridian that runs through greenwich, england, is internationally accepted as the line of 0 degrees longitude, or prime meridian. The antimeridian is halfway around the world, at 180 degrees. It is the basis for the international date line.
half of the world, the eastern hemisphere, is measured in degrees east of the prime meridian. The other half, the western hemisphere, in degrees west of the prime meridian.
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Longitude is measured by imaginary lines that run around the Earth vertically (up and down) and meet at the North and South Poles. These lines are known as meridians. Each meridian measures one arcdegree of longitude. The distance around the Earth measures 360 degrees.Nov 6, 2012
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