Discussion
The Prime Meridian passes through which city?
Answer: C
Correct answer: London
The Prime Meridian runs through Greenwich in southeast London, where the Royal Observatory stands, and it is the zero from which longitude is measured east and west. Unlike the equator, whose position is fixed by the Earth’s rotation, the choice of prime meridian is purely a convention. Several nations once used their own - Paris, Cadiz, Rio and others - and Greenwich was adopted internationally at the Washington conference of 1884, largely because most of the world’s shipping already used British charts. From it comes Greenwich Mean Time and, in modern practice, Coordinated Universal Time, against which every time zone is expressed as an offset. A small curiosity: modern satellite measurement places the true zero of longitude about 100 metres east of the brass line visitors stand on, because the reference frame now used differs slightly from the local vertical the Victorian astronomers worked with.
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