👉The distance between them is measured in ‘degrees of longitudes’.
👉 All meridians are of equal length.
👉 The meridians passed through Greenwich, where the British Royal Observatory is located. This meridian is called the Prime Meridian.
👉 The value of Prime Meridian is 0° longitude and from it, we count 180° eastward as well as 180° westward.
👉 The Prime Meridian and 180° meridian divide the earth into two equal halves, the Eastern Hemisphere and the Western Hemisphere.