Question

what is mean by 0° longitude in special terms. why it called so.?

Answer 1

Imaginary lines running horizontally around the globe. Also called parallels, latitude lines are equidistant from each other. ... Unlike latitude lines, longitude lines are not parallel. Meridians meet at the poles and are widest apart at the equator. Zero degrees longitude (0°) is called the prime meridian.

Answer 2

because the sun shines perpendicularly over it , that is equator