Lines of longitude, or meridians, are drawn a little differently. The line of longitude corresponding to 0°, which passes through Greenwich in London, is called the Prime (or Greenwich) Meridian.

A series of lines crisscrosses the world's maps and globes. The 180 horizontal latitude lines, and 360 vertical lines that mark east and west longitude, are vital to navigators.

The globe shows the lines of latitude and the degrees of north and south. The line labelled 0° longitude is called the Prime Meridian or the Greenwich Meridian and runs through London.

Longitude lines loop the planet from north to south, starting at each pole. How does latitude work? Imagine a belt around our planet's 25,000-mile waistline, the equator.

To help locate where a place is in the world, people use imaginary lines called latitude and longitude. Find out more with this year 3/4 BBC Bitesize geography guide.