The Prime Meridian.
A line of constant longitude is often referred to as a 'meridian'.
another name for a line of longitude is meridian.
A Line of longitude is an invisible line going north to south on the earth. The main one is called the prime meridian.
meridian
The 0' line of longitude is called the Greenwich Meridian because it passes through Greenwich, Lonon
The so-called 'lines' of longitude are also called 'meridians'. The Prime Meridian is a line of longitude. It's the line made out of all the points on Earth whose longitude is zero.
International Date Line
Any line that joins the north and south poles has the same longitude at every point on it. It's called the 'meridian' of that longitude.
The Prime Meridian
A line of constant longitude is often called a "meridian". A line of constant latitude is often called a "parallel".
The Prime Meridian or 0 degrees longitude.
It's called a Meridian.