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 best were those set by astronomers based on the position of the sun in the sky ...

BM3CMJ Royal Observatory Greenwich with 24-hour Gate Clock, Ordnance Survey Bench Mark and Public Measures of Length This means when the clocks go back, the country returns to the default time ...

Visitors to the world-famous Meridian Line at the Royal Observatory in Greenwich, south-east London, are to be charged for the first time in 10 years. Entrance to the building's courtyard ...