Later in 1831, the Greenwich Time Bell was installed on the roof of the house, after the observatory tested chronometers used by the Royal Navy. Later in 2007, the modern Peter Harrison ...

In 1884, an international conference decided that the Prime Meridian, which runs through Greenwich, would be the starting point for timekeeping. The line runs through the Royal Observatory ...

To fix this the Royal Observatory decided to set a standard time that everyone could set clocks to. This was called Greenwich Mean time(GMT). GMT became the only official time used in the UK ...

The Royal Observatory Greenwich is the home of Greenwich Mean Time and the Prime Meridian of the World. It is also home to London's only planetarium, the Harrison timekeepers and the UK's largest ...

The reversible transit circle has been fairly fully employed in making 7,234 transit observations, including fifty-seven of the moon, which were undertaken in view of the fact that lunar ...

Ryan Imperio has been named the Royal Observatory Greenwich’s Astronomy Photographer ... Crossing the field-of-view in just 0.2 seconds, ISS transits of the Sun are particularly rare to see ...