Greenwich Meridian
/ˈɡriːnɪtʃ ˈmɛrɪdiːən/ · green·wich mer·i·di·an
noun
- An imaginary line that passes through the Royal Observatory in Greenwich, London, and serves as the reference point for universal time and longitude. The plane took off at 10:00 AM, which was 7:00 AM on the Greenwich Meridian.
noun
- A line of longitude that passes through the Royal Observatory in Greenwich, London, and is used as a reference point for navigation and timekeeping. The sailor used the Greenwich Meridian to determine his ship's position at sea.
Synonyms
Did you know? The Greenwich Meridian is also known as the Prime Meridian, and it is the reference point for all time zones around the world.