Because it's not based on any physical characteristic of the Earth ...
like the Equator is ... but instead, was made up by people and could
have been placed anywhere.
Prime Meridian
The Prime Meridian or 0 degrees longitude.
This imaginary circle is called the prime meridian. it is an imaginary line that circles the globe vertically and is typically measured as beginning in Greenwich, England.
prime meridian also called greenwich meridian prime meridian also called greenwich meridian
The line name at 0 degrees longitude is commonly referred to as the Prime Meridian. This line passes through Greenwich, London, United Kingdom and can also be referred to as the International Meridian or Greenwich Meridian.
Another name is Prime Meridian.
The Prime Meridian
prime meridian.
No. The prime meridian if on the side of the earth not the center. The prime meridian is the 0 latitude line. On the other side you have the 180 degree latitude line, sometimes called the international date line.
The meridian exactly halfway around the world from the prime meridian is called the 180th meridian or the antimeridian. This line represents the opposite side of the Earth from the prime meridian and is where the International Date Line is located.
The imaginary line is called the Prime Meridian.
The time meridian is each standard time zone roughly centered on a line of longitude exactly divisible by 15 degrees and the prime meridian is the starting point for the standard time zones an arbitrary longitude line.