WHAT IS LATITUDE - [ Ссылка ]
5 MAJOR LINES OF LATITUDE - [ Ссылка ]

Lines of longitude, also called meridians, are imaginary lines that divide the Earth. They run north to south from pole to pole, but they measure the distance east or west. The prime meridian, which runs through Greenwich, England, has a longitude of 0 degrees.

The prime meridian is arbitrary, meaning it could be chosen to be anywhere. Any line of longitude can serve as the 0 longitude line. However, there is an international agreement that the meridian that runs through Greenwich, England, is considered the official prime meridian.

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