M
Meridian
子午線／シゴセン
子午线
Meridian
Méridien
Glossary
Thematic
Time
An imaginary circle intersecting the Earth's poles. The meridian of a given location is the circle that intersects it and the two poles. The Greenwich meridian is taken as the prime meridian. Time calculated from the Greenwich meridian is referred to as universal time (UT or GMT).