What is the 180 degree longitude line?
The 180 degree longitude line marks the halfway point on the circumference of the globe. The beginning point is the Greenwich Meridian, which is located at 0 degrees. The 180 degree line is also known as the International Date Line.Longitudinal LinesThe earth’s circumference is divided into 360 evenly spaced lines that span the globe. At the equator, each degree of longitude is equal to approximately 70 miles.Arbitrary SettingThe zero degree mark is set at Greenwich, England, and is referred to as the Greenwich Meridian. This location is purely arbitrary and has only been in effect since 1884. The Greenwich Meridian also passes through London, England.180 DegreesThe halfway mark occurs at 180 degrees and is represented by a longitudinal line that runs through the middle of the Pacific Ocean. This line, called the International Date Line, runs between both poles. The Date line also divides the globe into the Western and Eastern Hemispheres.Two hemispheresEach hemisphere has 180 longitud
