58. Imaginary lines that run through both poles (N/S).
The central line of longitude is called the Prime
Meridian and it runs through the Royal
Observatory in Greenwich, England. Lines tell us
how far east and west we are from the PM.
59. Imaginary lines which tell us how far north or
south one is from the Equator; the imaginary line
exactly ½ way between N and S poles.
60. Central line of longitude that runs through N and S
poles; Greenwich, England.