In order to keep time accurately, we have always had to set our clocks by the ticks of a better one. Until the 1950s, the ...

In the early hours of the morning clocks moved forward by one hour, which means we've said goodbye to Greenwich Mean Time (GMT) and welcomed British Summer Time (BST). The change happened at 1am, ...

Chart the course of maritime navigation from ... Thanks to the Harrison's clock keeping exact Greenwich Mean Time, sailors could then determine how many hours they were before or after that ...