The meridian passes through Greenwich, which is home to the British Royal Observatory.
The Prime Meridian is considered to be this meridian.
These meridians are estimated to be 0 degree longitudes, and from there, we consider 180 degree to the east and 180 degree to the west.
So, the Prime Meridian is also referred to as the Greenwich Meridian.
When the sun is at its highest point in the sky on the Prime Meridian of Greenwich, all points along this meridian will have late morning or early afternoon.
Final Answer:
The Prime Meridian is the fictional line that runs through Greenwich to represent 0 degree longitude. Ptime Meridian is also known as the Greenwich Meridian because it passes through the London neighborhood of Greenwich.