- the first meridian
- the prime meridian
Generated: Refers to the designated zero degrees longitude from which all other longitudes are measured; it serves as a reference point for global navigation and timekeeping.
The first meridian is the starting point for longitude.
Generated: Specifically indicates the prime meridian, which is historically the meridian running through Greenwich, England, that has been widely accepted for global timekeeping purposes.
The prime meridian passes through Greenwich, London.
汉语词典Chinese definitions