prime meridian
line of longitude, at which longitude is defined to be 0°
Brussels Meridian
the meridian of the Royal Observatory of Belgium in Brussels
Meridian of Antwerp
one of the prime meridians
Paris meridian
meridian line running through the Paris Observatory in Paris, France
Ferro Meridian
line of longitude running through El Hierro (Ferro), Canary Islands
United Kingdom Ordnance Survey Zero Meridian
prime meridian used by the OSGB36 reference system
Greenwich Meridian
the meridian of the British Royal Observatory in Greenwich, England, when distinguished from the general concept of a prime meridian
Florence meridian
line of longitude
Warsaw meridian
meridian line in Poland