Ironically it is Britain which is, in a real way, still divided on "which meridian?" Since 1884, the world's "Longitude 0" has been that which the seventh Astronomer Royal, George Airy, established at the Royal Observatory, Greenwich, in 1851. But since the Ordnance Survey, begun in the 1780s, declined to adjust British land maps to it for practical reasons, these are still based on the third Astronomer Royal James Bradley's zero meridian of 1750 - which at Greenwich is 19 feet to the west.
PIETER van der MERWE
National Maritime Museum Greenwich