This beautifully illustrated book is a classic among historical accounts of Greenwich Time and its relationship with longitude. It relates the progress of Greenwich Time from 1676, when it was first established for use at the new Royal Observatory, to the present day when it has become the basis for timekeeping the world over.

It is also the story of finding the longitude at sea, which was the specific problem that the Observatory was founded to solve. Greenwich became a household name when in 1884 its longitude was chosen as the Prime Meridian.

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