Wait, the earth has lines running through it?

     

No, no, no. Not In reality. However, maps often have these little lines drawn vertically and horizontally on it. One of these imaginary lines is one you might be familiar with: the equator.        
      The other lines that run parallel to the equator are called latitude.
But wait! What about those other lines that intersect? Those are called longitude, or meridians. The center meridian is called the prime meridian, which connects both poles.