See related links below for pictures of the Greenwich Meridian.
Greenwich is a place in England. If you look at a map, places to the left are west of Greenwich and places to the right are east. A meridian is any line which runs from north pole to south pole and the meridian that runs through Greenwich is called the Greenwich Meridian and by definition is zero degrees. All other meridians are measured in degrees from zero. E.g. New York is -74 degrees, meaning it's west of Greenwich by 74 degrees.
There is only one Greenwich Meridian (which I think is what you're asking about). It is the zero degrees line of longitude, so when a map location is given the longitude is given as being east or west of Greenwich. It position, going through Greenwich is partly historical and partly practical - opposite the meridian is the International Date Line, which for practical reasons is placed in the sea.
the angular distance of a place east or west of the meridian at Greenwich, England, usually expressed in degrees and minutes. They're the vertical lines on a map or globe.
That is the Prime Meridian. The Equator is zero degrees latitude.
It is the Prime Meridian, which is zero degrees longitude, and runs from the North Pole, through the Royal Observatory, Greenwich, London, England, and to the South Pole.
no there is not a picture on this page
The Greenwich Meridian, also known as the prime meridian or International Meridian, is the "starting point" for dividing the Earth's surface into time zones. Each time zone is 15 degrees of longitude wide (with local variations) and the local time is one hour earlier than the zone immediately to the east on the map.
The prime meridian, 0° longitude, passes through the old Greenwich Observatory.
It's a north/south line, so it passes through many different places in England. I once went through an entire small-scale map of England and came up with a list of about 30 towns that the Prime Meridian runs through, but I'm not going to do that now. The important spot ... the thing that actually defines where the Prime Meridian is ... is the transit room of the Royal Observatory in Greenwich, a suburb of London. There's actually supposed to be a groove in the floor of that room that marks the official meridian ... mostly for show and ceremony, now that we have the GPS.
The Greenwich Meridian, also known as the prime meridian or International Meridian, is the "starting point" for dividing the Earth's surface into time zones. Each time zone is 15 degrees of longitude wide (with local variations) and the local time is one hour earlier than the zone immediately to the east on the map
The prime meridian passes through Africa, running through the Royal Observatory in Greenwich, London. The equator is another significant meridian that runs through Africa, dividing the continent into Northern and Southern Hemispheres.
All the lines of longitude run from pole to pole. The Prime Meridian (baseline?) is zero and passes through the Greenwich Observatory, London, England.