Meridian | Line

longitude, serving as the "starting line" from which every other location on Earth is measured east or west.

You don’t just have to imagine it. At the Royal Observatory in Greenwich, you can stand with one foot in the Eastern Hemisphere and one foot in the Western Hemisphere. A physical brass line (and a powerful green laser at night) marks the for tourists. meridian line

The Meridian is a straight line on the ground. Fact: It is a great circle on a sphere. If you travel exactly along it, you would follow a curved path over the Earth’s surface. longitude, serving as the "starting line" from which