Prime or Greenwich.
The name of the meridian that is labeled 0 is the Prime Meridian.
The Grand Meridian
The meridian labeled zero is called the Prime Meridian. It is located at 0 degrees longitude and passes through Greenwich, England.
Meridians east of the prime meridian are labeled with the letter E, which stands for east. The prime meridian itself is labeled as 0° longitude, and meridians to the east are assigned increasing positive longitude values.
The line labeled 0 degrees longitude is known as the Prime Meridian, while the line labeled 0 degrees latitude is called the Equator. The Prime Meridian serves as the reference point for measuring longitude, while the Equator is the reference point for measuring latitude, dividing the Earth into the Northern and Southern Hemispheres.
scientist wanted a starting point that was labeled 0 degrees.
The equator is labeled as 0 latitude because it is the starting point for measuring latitude north and south. The prime meridian is labeled as 0 longitude because it is the starting point for measuring longitude east and west. This standardization helps provide a universal reference point for location coordinates on Earth.
If there are any east-west lines printed on your map or globe, there should never be more than one. It may or may not be labeled "Equator".
That meridian is labeled " 60°W ".
the prime meridian, which is the line that goes through Greenwich, England
W
Prime Meridian. 180 longitude is the Iinternational Date Line, and the equator is 0 degrees latitude