London Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

16.85

Bortle class

Class 9 (Class 9)

Darkness Quotient

15%

Dataset

August 2026

Inner city sky

London: The Practical Verdict

London, as a global metropolis, offers little respite for stargazers due to its extreme light pollution. The severe urban sky conditions make it difficult to engage in any meaningful night-time observation, particularly in the realms of deep-sky astronomy. With a dense urban environment, the primary limiting factor for astronomers is London’s bright light pollution.

Observing from London means focusing on the most visible targets: the Moon, planets, and bright stars dominate the list. Narrowband imaging is possible, though with considerable caution. Broad-spectrum targets like galaxies and faint nebulae are not feasible, reflecting the significant limitations posed by the city's sky quality.

Though limited improvements are available, darker skies like those around Barningham, about 120 km north-east, offer more hope. Still, even these locations are only a modest upgrade, with local conditions remaining a critical factor.

At a Glance

Overall

Severe urban sky - This is a severely light-polluted urban sky. Only the Moon, planets, bright stars, and a few specialist targets remain practical.

Milky Way

Not visible - The Milky Way is not visible from this sky.

Best targets from here

Moon, planets, bright stars, double stars, solar system events, narrowband imaging only with care

Do not prioritise

visual deep-sky observing, broadband galaxies, reflection nebulae, widefield Milky Way

Limited nearby upgrade

Barningham is the strongest nearby option but remains Bortle 5; the improvement is real but modest.

Moderate dark window

London's longest dark windows fall in December and January, with the shortest nights around June and July. Plan deep-sky sessions around the autumn and winter months for the best combination of long nights and true astronomical darkness.

Frequently Asked Questions

Can you see the Milky Way from London?

No. London is a Bortle Class 9 sky with SQM 16.85, so the Milky Way is not visible from the city. For Milky Way photography, look for a Bortle 4 or darker site.

What Bortle class is London?

London is Bortle Class 9 (SQM 16.85), a severe urban sky for astronomy.

Is London good for stargazing?

Not for serious deep-sky observing. London is a severe urban sky where the Moon, planets, and a handful of bright targets are the realistic options from the city itself.

Is London good for astrophotography?

Broadband deep-sky imaging is heavily compromised from London and a Bortle 4 or darker site is strongly recommended. Even narrowband imaging is difficult from London without careful processing.

What can you observe from London?

Primary targets from London include Moon, planets, bright stars, double stars, solar system events. Targets such as visual deep-sky observing, broadband galaxies, reflection nebulae are not realistic from this sky.

Where are darker skies near London?

The closest meaningfully darker mapped site is Hebing End, about 42 km south south east of London, reaching Bortle 7.

When is the sky darkest in London?

The sky over London is darkest around January, December. Significant summer limitation: around 60 nights per year have no true astronomical darkness.

Is light pollution in London getting better or worse?

Long-term light pollution over London has been broadly stable across the available measurements.

• Hebing End

  Direction

  SSE

  Distance (km)

  41.8

  SQM

  19.55

  Bortle

  7

• Duddleswell

  Direction

  SSE

  Distance (km)

  54.2

  SQM

  20.04

  Bortle

  6

• Newfoundout

  Direction

  SSW

  Distance (km)

  53.8

  SQM

  20.01

  Bortle

  6

• Cranbrook Common

  Direction

  SE

  Distance (km)

  64.2

  SQM

  19.90

  Bortle

  6

• Barningham

  Direction

  NE

  Distance (km)

  119

  SQM

  20.78

  Bortle

  5

• Spalding

  Direction

  SSE

  Distance (km)

  145.7

  SQM

  20.70

  Bortle

  5