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).
Terms with the same letter
Mainspring winder Maker's mark Malachite Maltese Cross Manual Manufacture Marcasite Marine chronometer Marker Marquise Master Mastership Mechanism Melee Meridian Mesh Microcrystallin Micron Microsecond Mixed cut Module Mohs scale Moissanite Moon phases Moonstone Morganite Moss agate Mother-of-pearl Motion work Movement Mysterious (clock or watch) Mystery setting
