The Prime Meridian.
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The zero point for longitude runs trough (is in) Greenwich, England.
Latitude and Longitude are used to point to exactly where you want to be
Every point on earth has both a latitude coordinate and a longitude coordinate. That's how you tell people where the point is, even if they're not there.
The reference for longitude ... the definition of 'zero' longitude ... is the Prime Meridian. That imaginary line joins the north and south poles, and runs through Greenwich, a suburb of London, UK.
longitude and latitude