What is a meridian of longitude?

Answer 1

A meridian of longitude is an imaginary line made up of all the points on earth with

that longitude. If you were to draw any meridian on a globe, it would look like a

solid half-circle between the north and south poles.

Answer 2

A meridian of longitude is an imaginary line that runs from the North Pole to the South Pole, marking a specific point's east-west position on Earth. The Prime Meridian, at 0 degrees longitude, is the starting point for measuring east and west.