J-6 Greenwich Prime Meridian of the world

Le méridien de Greenwich est un premier méridien, c’est-à-dire un méridien où la longitude est définie comme égale à 0°. Il passe à travers l'Observatoire royal de Greenwich, à Greenwich (banlieue de Londres), au Royaume-Uni.
il définit les hémisphères est et ouest.

Every place on earth is measured in terms of its distance east or west from the Greenwich Meridian. The line itself divides the eastern and the western hemispheres of the earth, just as the Equator divides the northern and the southern hemisphere.

Every place on Earth is measured in terms of its distance east or west from the Greenwich Meridian. The line itself divides the eastern and western hemispheres of the Earth, just as the Equator divides the northern and southern hemispheres - See more at: http://www.visitgreenwich.org.uk/things-to-do/stand-home-time/#sthash.o5jnYXOH.dpuf

Every place on Earth is measured in terms of its distance east or west from the Greenwich Meridian. The line itself divides the eastern and western hemispheres of the Earth, just as the Equator divides the northern and southern hemispheres - See more at: http://www.visitgreenwich.org.uk/things-to-do/stand-home-time/#sthash.o5jnYXOH.dpufv

Every place on Earth is measured in terms of its distance east or west from the Greenwich Meridian. The line itself divides the eastern and western hemispheres of the Earth, just as the Equator divides the northern and southern hemispheres - See more at: http://www.visitgreenwich.org.uk/things-to-do/stand-home-time/#sthash.o5jnYXOH.dpuf

Every place on Earth is measured in terms of its distance east or west from the Greenwich Meridian. The line itself divides the eastern and western hemispheres of the Earth, just as the Equator divides the northern and southern hemispheres - See more at: http://www.visitgreenwich.org.uk/things-to-do/stand-home-time/#sthash.o5jnYXOH.dpuf