* Longitude lines run north-south. They are imaginary lines that circle the Earth, measuring distances east and west of the Prime Meridian.

* The Prime Meridian is at 0 degrees longitude. It runs from the North Pole to the South Pole, passing through Greenwich, England.

* Zero degrees North longitude is meaningless. North longitude doesn't exist. Longitude lines measure east-west, and "north" refers to a direction, not a longitude coordinate.

What you might be thinking of:

* The North Pole is located at 90 degrees North latitude, and is considered the northernmost point on Earth.

* The equator is located at 0 degrees latitude and circles the Earth, dividing it into the Northern and Southern Hemispheres.

Let me know if you have any other questions!