Question

Definition of prime meridian

Answer 1

The prime meridian is the line of longitude, specifically at 0 degrees longitude, which divides the Earth into the Eastern Hemisphere and the Western Hemisphere. It serves as a reference point from which other longitudes are measured. The prime meridian is also used as the basis for determining time zones around the world, with all time zones east of the line being ahead in time and those to the west being behind. The most commonly recognized prime meridian is the one that passes through the Royal Observatory in Greenwich, London, known as the Greenwich Meridian or the International Meridian.