What is another word for line of longitude?
Pronunciation: [lˈa͡ɪn ɒv lˈɒnd͡ʒɪtjˌuːd] (IPA) 
A line of longitude, also known as a meridian, is an imaginary line that runs from the North Pole to the South Pole on the surface of the Earth. It is used to measure the angular distance east or west of the Prime Meridian, which is designated as 0° longitude. Other synonyms for line of longitude include meridian circle or simply meridian. A degree of longitude is equivalent to 111.321 km, and there are 360 degrees of longitude in a complete circle around the Earth. Longitude is an important component in the measurement of global positioning, navigation, and timekeeping systems.
