prime meridian JUST WRITTEN FOR YOU
/praɪm ˈmɛrɪdiən/ · prime.mer.i.di.an
noun
- The reference line at 0° longitude, passing through Greenwich, England, from which longitude east and west is measured. The prime meridian is used as a reference point for navigation and timekeeping around the world.
- A line of longitude that passes through the Royal Observatory in Greenwich, England. The prime meridian is marked by a brass strip on the floor of the Royal Observatory.
Synonyms
Did you know? The prime meridian was originally defined as passing through the Airy Transit Circle at the Royal Observatory in Greenwich, England, but it was later redefined to pass through the Earth's center, rather than the observatory's location.