The geographic coordinate system is based on the longitude and latitude lines. Greenwich is important because it is where the central latitude line goes through.
Explanation:
The geographic coordinate system is a system of intersecting lines that cut each other under 90 degrees angle. Some of the lines run east to west, while the other run north to south. These lines are called latitude lines and longitude lines, with the latitude ones showing north and south distances, while the longitude ones showing east and west distances.
The central longitude line is located at Greenwich, or rather runs through it. It is the line that separates the Earth into Eastern Hemisphere and Western Hemisphere. From it we have measuring of distance toward east and west, with Greenwich being at 0 degrees, and the furthest places from it being 180 degrees, on the opposite side of the planet. Greenwich is also important because it is taken as the central time zone in the world.
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