Located in East London is the Royal Greenwich Observatory.

Passing directly through the observatory is an imaginary line that extends from the North Pole to the South Pole.

This line is significant because it's the reference point for every other line of longitude in the entire world.

What makes it even more remarkable is that there's no objective reason for this particular

line to be so important. Learn more about the Prime Meridian and why it is where it is on this

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Before I get into the prime meridian and its very strange history, I should first provide an overview of the geographic coordinate system, also sometimes known as the spherical or geodetic coordinate system. The system consists of two sets of imaginary lines

superimposed upon the Earth's sphere. The first set of lines are the lines of latitude. Lines

of latitude, also known as parallels, are imaginary horizontal lines that run east-west around

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