What the observatories are
The Royal Observatory Greenwich is a historic centre of astronomy, navigation and timekeeping. Founded by King Charles II in 1675, it played a pivotal role in the adoption of the Greenwich Prime Meridian and the standardisation of Greenwich Mean Time (GMT). Today, visitors can explore historic instruments, stand astride the Prime Meridian and attend planetarium experiences (Royal Observatory Greenwich History; Space.com).
Bishop Observatory was established in 1836 by George Bishop near Regent’s Park. Although the original observatory no longer exists, its legacy survives in historical research and in pop-up art installations in London. The Bishop Observatory immersive experience combines technology, wellness and public engagement (georgebishopjr.com; Experience UK; Secret London).
History
Royal Observatory Greenwich
Established by royal decree in 1675, the Royal Observatory aimed to solve the longitude problem that challenged maritime navigation. Under the first Astronomer Royal, John Flamsteed, it catalogued thousands of stars, providing data for navigation and laying foundations for modern astronomy (Royal Observatory Greenwich History; Space.com).
The 18th-century longitude problem led to the establishment of the Board of Longitude in 1714. John Harrison’s marine chronometer, tested and certified at Greenwich, enabled accurate determination of longitude at sea. Nevil Maskelyne’s contributions, including lunar distance tables and star charts, also advanced navigation (Avi-8; Cosmic Astra).
In 1884, the International Meridian Conference designated Greenwich as the Prime Meridian, at 0° longitude, establishing its role in global navigation and the adoption of GMT as the world’s time standard (Clock Wiki; Cosmic Astra).
Since 1833, the red Time Ball atop the Octagon Room has dropped daily at 1:00 pm, providing a visual time signal for ships on the Thames and helping set a global standard for public timekeeping (Greenwich World Heritage).
The Observatory’s instruments include astronomical clocks, telescopes such as the Great Equatorial Telescope, and John Harrison’s marine chronometers. It served as Britain’s national centre for timekeeping innovation throughout the 19th century (Greenwich World Heritage).
Scientific operations moved away from Greenwich because of light pollution, relocating to Herstmonceux in 1948 and later to Cambridge. The Greenwich site is now a museum and education centre, with permanent galleries, interactive exhibits and the Peter Harrison Planetarium (Nomadic Matt). It is a UNESCO World Heritage Site.
Bishop Observatory
Also known as George Bishop’s Observatory, Bishop Observatory became a centre for double-star and minor-planet research. Its 7-inch Dollond refractor enabled research by William Rutter Dawes on double stars and discoveries by John Russell Hind and Albert Marth of eleven minor planets between 1847 and 1854. The observatory also fostered collaborations with Eduard Vogel and Norman Robert Pogson (georgebishopjr.com).
- 1836 Observatory established.
- 1839–1844 Dawes conducted double-star research.
- 1845 The discovery of asteroid Astræa prompted a search for minor planets.
- 1847–1854 Eleven minor planets were discovered.
- 1861 The observatory ceased operations; its instruments were later moved and donated to Italy.
What to see and do
Royal Observatory Greenwich
- Prime Meridian Line Stand with one foot in each hemisphere.
- Historic instruments See Harrison’s chronometers and the Great Equatorial Telescope.
- Time Ball Watch the daily drop at 1:00 pm.
- Planetarium shows Attend immersive astronomy shows at London’s only public planetarium.
- Special events 2025 marks the Observatory’s 350th anniversary, with talks, workshops, stargazing and the Astronomy Photographer of the Year exhibition (Visit Greenwich).
Bishop Observatory pop-up
The Bishop Observatory pop-up at 56 Old Broad Street reimagines the observatory through immersive art experiences focused on mindfulness and mental health.
- Harmony 2.0 EEG headsets capture participants’ brainwaves and generate live visuals, culminating in guided group meditation (Experience UK; Secret London).
- Soul Paint Technology transforms visitors’ emotions into visual art, offering a personal creative journey.
Practical visiting information
Royal Observatory Greenwich
- Hours Daily, 10:00 am–5:00 pm; last admission is at 4:15 pm. Hours may vary on holidays, so check the official website.
- Tickets Adult tickets cost approximately £16, with discounts for children, seniors and families. Planetarium shows require a separate ticket, approximately £10.
- Tours Guided tours and educational programmes are available. Advance booking is recommended, especially during special events.
- Accessibility The site and facilities are wheelchair-accessible, with clear signage and step-free access.
- Transport The nearest station is Cutty Sark DLR.
Regent’s Park and the Bishop Observatory site
The original Bishop Observatory building is gone. Its site is within Regent’s Park’s Inner Circle and is now part of Regent’s College London. No observatory remains and no public tours are available. Regent’s Park is open daily from 5:00 am until dusk (Royal Parks). The park has paved paths, accessible restrooms and step-free areas.
For public astronomy events, join the Baker Street Irregular Astronomers (Londonist).
Bishop Observatory pop-up
- Location 56 Old Broad Street, near Liverpool Street and Bank Underground stations.
- Hours Typically open in January, 10:00 am–6:00 pm; check event pages for annual details.
- Tickets Free, but places are limited and should be booked online in advance. Donations to CALM (Campaign Against Living Miserably) are encouraged.
- Accessibility Wheelchair-accessible; contact the venue about specific needs.
- Photography Photos are permitted, but flash is not allowed during meditation sessions.
Tips
Arrive early at the Royal Observatory if you want to see the Time Ball drop. Public transport is a convenient way to reach the site. Consider advance booking for tours, educational programmes and special events. An Audiala app is also suggested for self-guided tours and event updates.
Nearby places and amenities
- Greenwich National Maritime Museum, Cutty Sark and Greenwich Park.
- Regent’s Park Queen Mary’s Gardens, ZSL London Zoo and the Sherlock Holmes Museum; Baker Street museums are also nearby.
- City of London Tower of London, St. Paul’s Cathedral and vibrant markets. The Bishop Observatory pop-up can be combined with other central London attractions.
- Cafés and restrooms are available at Greenwich and Regent’s Park.
- Astronomy-themed souvenirs are available at the Royal Observatory Greenwich shop.
Frequently Asked Questions
Royal Observatory Greenwich
- When is the Observatory open? Daily, 10:00 am–5:00 pm. Check the official site for holiday hours.
- How much are tickets? Around £16 for adults, with discounts available. Planetarium shows cost extra.
- Are tours offered? Yes. Advance booking is recommended.
- Is the site accessible? Yes, including wheelchair access.
- How do I get there? Use Cutty Sark DLR and follow the signs through Greenwich Park.
Bishop Observatory site and pop-up
- When is the pop-up open? Usually in January, 10:00 am–6:00 pm; check event sites for dates.
- Is admission free? Yes, but book in advance. Donations are welcome.
- Can I take photos? Yes, but no flash during meditation sessions.
