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As you might expect, the complete answer isn't short and simple. Since that year, various

countries have joined and left the agreement from time to time. Also, satellite navigation

systems, for various reasons, have used prime meridians that are slightly offset from the

one we're talking about ... the GPS system, operated by the USA, has its 00:00:00 longitude

about 100 meters east of the original Prime Meridian.

But the basic simple answer to the question is: 1851

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Q: In what year did people decide that the meridian that passed through Greenwich should be the prime meridian?
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