Basically London
noon
equator
The prime meridian is a line at 0 degrees longitude.
The equator and the Prime meridian meet at zero degrees latitude and longitude.
they are
noon
equator
The prime meridian is a line at 0 degrees longitude.
The prime meridian is a line at 0 degrees longitude.
The equator and the Prime meridian meet at zero degrees latitude and longitude.
longitude
the Prime meridian is a longitudinal line at 0 degrees and runs north and south. There is no 180 degrees below or above it. 180 degrees latitude doesn't exist. Latitudes range from 90 degrees south, at the south pole, through zero, at the equator, to 90 degrees north, at the north pole. There are no latitude numbers greater than 90.
The prime Meridian is 0 degrees longitude.
they are
That would be the Prime Meridian.
The Prime Meridian is at zero degrees longitude and every possible latitude.
0 degrees latitude and 0 degrees longitude.