Keeping track of time helps us make sense of our world. Read all about the history of timekeeping and the story the Prime Meridian, and discover why Greenwich is known as 'the home of time'.

When do the clocks go back?
Marking the end of British Summer Time, the clocks go back in October, giving us an extra hour in bed
Time before Greenwich Mean Time: the confusing case of the traveller's watch
Before time became standardised, different areas of the country all kept their own 'local time'. This gold traveller's watch with two minute hands shows how tricky that could be
The BBC pips: the Royal Observatory and the Greenwich Time Service
Discover the story behind the Greenwich time pips, first broadcast by the BBC 100 years ago in 1924
When do the clocks go forward in 2025?
Marking the start of British Summer Time, the clocks 'spring forward' in March, meaning we'll lose an hour's sleep
What is Greenwich Mean Time (GMT) - and why does it matter?
How did local clock time in Greenwich change the world?
20 May 2016
100 years of Daylight Saving
On the centenary of Daylight Saving in Britain, Curator of Horology, Rory McEvoy looks back at its history.
Sir George Biddell Airy
Astronomer George Biddell Airy designed the legendary Airy Transit Circle telescope which defined the Prime Meridian at the Royal Observatory Greenwich.
The Greenwich Time Ball and one time for all
How do you know that your watch, clock or phone is telling exactly the right time? At one time, the only way was to look to the roof of the Observatory.
Meridian astronomy
Meridian astronomy is the meticulous surveying of the stars so that positions and movements of stars can be known accurately.
Airy's Transit Circle and the dawn of the Universal Day
The story of Astronomer Royal George Biddell Airy and the remarkable Airy Transit Circle telescope he designed at the Royal Observatory Greenwich