Skip to main content
  • Become a member
  • Donate
  • Shop
  • Venue hire
  • Search
Royal Museums Greenwich
Main navigation
Royal Museums Greenwich
Search
  • Plan your visit
    • Tickets and prices
    • Getting here
    • Accessibility
    • Family visits
    • Group visits
    • School visits
    Cutty Sark
    Cutty Sark Open daily 10am - 6pm Last entry 5.15pm Adult: £22 | Child: £11 Members go free
    Free National Maritime Museum
    National Maritime Museum Open daily 10am-5pm Last entry 4.15pm Free entry Booking recommended
    Free Queen's House
    Queen's House Open daily 10am - 5pm Last entry 4.15pm Free entry Booking recommended
    Royal Observatory
    Royal Observatory Open daily 10am-7.45pm Last entry 7pm Adult: £24 | Child: £12 Members go free
  • What's on
    • Planetarium shows
    • Exhibitions
    • For families
    • Member events
    • Talks and tours
    National Maritime Museum Events and festivals
    Rhythm! Go with the flow at the National Maritime Museum's vibrant dance festival, inspired by the ocean and movement
    Cutty Sark Experiences
    Cutty Sark Rig Climb Experience life at sea and climb the rigging of one of London's true icons
    National Maritime Museum Events and festivals
    Ocean Songs Live music at the National Maritime Museum celebrating our ocean planet, its mythology, natural wonders and as-yet-undiscovered depths
  • Stories
    • Maritime history
    • Space and astronomy
    • Art and culture
    • The ocean
    • Time
    • Royal history
    Who was John Flamsteed, the first Astronomer Royal? Meet the man tasked with mapping the night sky from Greenwich, and discover how a feud with Isaac Newton shaped the early history of the Royal Observatory
    Blurring boundaries: the art of Maisie Broadhead Past or present, photographs or paintings? Artist Maisie Maud Broadhead challenges the viewer’s perceptions in two works now on display in the Queen’s House
    Where paths cross: a history of migration told through museum objects From maps and mementos to art and commemoration, discover surprising migration stories found in the National Maritime Museum's collection
  • Collections
    • Conservation
    • Research
    • Donating items to our collection
    Collections Online Search our online database and explore our objects, paintings, archives and library collections from home
    The Prince Philip Maritime Collections Centre Come behind the scenes at our state-of-the-art conservation studio
    Caird Library Visit the world's largest maritime library and archive collection at the National Maritime Museum
  • Learn
    • School trips and workshops
    • Self-guided school visits
    • Online resources and activities
    • Booking an on-site schools session
    • Booking a digital schools session
    • Young people and youth groups
  • Support us
    • Become a member
    • Donate
    • Corporate partnerships
    • Become a patron
    • Leave a legacy
    • Commemoration and celebration

Our sites

  • Cutty Sark
  • National Maritime Museum
  • Queen's House
  • Royal Observatory
  • Become a member
  • Donate
  • Shop
  • Venue hire
  • Search
  • Stories

Clocks and timekeeping

Clocks and timekeeping

Read all about the history of timekeeping and the amazing instruments in Royal Observatory Greenwich's collection

A black clock face with yellow hands and numbers round the dial

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
Painting of HMS Erebus stuck in the ice.

The lost chronometer: the timepiece that sailed with Charles Darwin and Sir John Franklin

Learn more about the marine chronometer that journeyed on board HMS Beagle before being lost at sea during Sir John Franklin's disastrous expedition
An image of a gold watch with a large face with roman numeral numbers on it, and two watch hands

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
Aerial photograph of Royal Observatory Greenwich.

The BBC pips: the Royal Observatory and the Greenwich Time Service

Discover the story behind the Greenwich time pips, first broadcast by the BBC over 100 years ago in 1924

What is a nocturnal?

Learn more about the nocturnal or ‘nocturlabe’, used for centuries to tell the time based on the movement of the stars
Mid 1900s photograph of Flamsteed House at the Royal Observatory

The Greenwich Time Lady: Ruth Belville

Discover the story behind the media sensation Ruth Belville, who brought the correct time from the Royal Observatory to London for almost 50 years.
A woman wearing blue surgical gloves examines a historic clock during conservation work in the Royal Observatory's Octagon Room

When do the clocks go forward?

Marking the start of British Summer Time, the clocks 'spring forward' in March, meaning we'll lose an hour's sleep
A woman wearing blue surgical gloves examines a historic clock during conservation work in the Royal Observatory's Octagon Room

Which years are leap years and can you have leap seconds?

Because the Earth takes a little over 365 days to orbit the Sun, we need to make adjustments to keep the seasons from drifting: leap years and even leap seconds

Why 12 months in a year, seven days in a week or 60 minutes in an hour?

While days and years are (fairly) neat astronomical events, what explains months, weeks, hours and minutes?
See all
Royal Museums Greenwich
Want to search our collection? Search here.

Our sites

  • Cutty Sark
  • National Maritime Museum
  • Queen's House
  • Royal Observatory

About us

  • What we do
  • Contact us
  • Jobs & volunteering
  • Press office
  • Sustainability

Commercial services

  • Brand licensing
  • Image licensing
  • Filming & photography
  • Publishing
  • Venue hire

Legal

  • Terms & Conditions
  • Privacy Notice
  • Accessibility
  • Cookie Policy
Follow us on Facebook Follow us on X Follow us on Instagram Follow us on Youtube Follow us on Weibo
Sign up to our newsletter