Question

Why are the lines of longitudes also called meridians​

Answer 1

Explanation:

Lines of longitudes are also called Meridians. These vertical lines are drawn from the North to South poles. The meridian through Greenwich, England, called the Prime Meridian, was set at zero degrees of longitude. The meridian on the opposite side of the earth from Greenwich is called the International Date Line (IDL), which is at roughly 180° longitude.