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 ...

The Royal Observatory Greenwich was first built in Greenwich, London, in 1675. At this original location, the observatory was set up with the goal of producing star charts and accurate time ...

In the Royal Greenwich Observatory Archives at Cambridge University Library, one man's papers take up a staggering 110 meters of shelving. In a new article from Isis: the Journal of the History of ...