What is another word for meridian line?
Pronunciation: [mɛɹˈɪdi͡ən lˈa͡ɪn] (IPA) 
The meridian line is an imaginary line that runs from the North Pole to the South Pole and passes through all the places on the Earth's surface. It is also referred to as a line of longitude or a prime meridian. The prime meridian is the specific meridian line that is used as a reference for measuring longitude. Other synonyms for the meridian line include the Greenwich meridian, which is the prime meridian used as a reference for navigation and timekeeping, and the 0-degree meridian. Additionally, meridians are sometimes referred to as lines of longitude because they run north and south, while lines of latitude are east and west.
