Bath Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

19.73

Bortle class

Class 6 (Class 6)

Darkness Quotient

43%

Dataset

April 2026

Bright suburban sky

Bath: The Practical Verdict

Bath is a small city in the South West of England, surrounded by suburban landscapes and affected by the light dome of nearby Bristol to the west-north-west. The overall stargazing conditions are limited due to moderate light pollution, with a bright suburban sky designated as Bortle 6. The Milky Way is not visible, and observing faint deep-sky objects is impractical.

From Bath, visual observing is best suited to bright targets such as the Moon, planets, and double stars, while imaging can focus on narrowband compositions of nebula cores using appropriate filters. Deep-sky surveying or photography of fainter galaxies and nebulae is heavily affected by the sky's background brightness.

If you wish to capture darker skies, heading to nearby Stalbridge, about 45 km south, offers substantial improvement. Classified as Bortle 4, this site facilitates observation and imaging of more challenging targets under better conditions.

At a Glance

Overall

Limited suburban sky - This is a limited sky for astronomy. The brightest targets remain accessible, but faint deep-sky observing is heavily compromised.

Milky Way

Not visible - The sky background is generally too bright for a reliable Milky Way view.

Best targets from here

Moon, planets, double stars, bright open clusters, narrowband imaging, bright nebula cores

Do not prioritise

broadband galaxies, reflection nebulae, visual faint nebulae, Milky Way photography

Best nearby upgrade

Stalbridge sits about 43 km south and reaches Bortle 4, roughly 3.3x darker.

Moderate dark window

Bath'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 Bath?

No. Bath is a Bortle Class 6 sky with SQM 19.73, 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 Bath?

Bath is Bortle Class 6 (SQM 19.73), a limited suburban sky for astronomy.

Is Bath good for stargazing?

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

Is Bath good for astrophotography?

Broadband deep-sky imaging is heavily compromised from Bath and a Bortle 4 or darker site is strongly recommended. Narrowband imaging of bright emission nebulae remains viable from Bath with appropriate Ha or OIII filters.

What can you observe from Bath?

Primary targets from Bath include Moon, planets, double stars, bright open clusters, narrowband imaging. Targets such as broadband galaxies, reflection nebulae, visual faint nebulae are not realistic from this sky.

Where are darker skies near Bath?

The closest meaningfully darker mapped site is Stratton on the Fosse, about 15 km south west of Bath, reaching Bortle 4.

When is the sky darkest in Bath?

The sky over Bath is darkest around January, December. Significant summer limitation: around 58 nights per year have no true astronomical darkness.

Is light pollution in Bath getting better or worse?

The long-term trend for Bath is gradually improving, with the sky darkening by about 0.04 SQM per year.

• Stratton on the Fosse

  Direction

  SW

  Distance (km)

  15.4

  SQM

  20.80

  Bortle

  4

• Stalbridge

  Direction

  S

  Distance (km)

  43.3

  SQM

  21.04

  Bortle

  4

• Ludney

  Direction

  SSW

  Distance (km)

  61.9

  SQM

  21.14

  Bortle

  4

• Broad Chalke

  Direction

  SE

  Distance (km)

  48.1

  SQM

  20.77

  Bortle

  5

• Sherborne

  Direction

  NE

  Distance (km)

  66.2

  SQM

  20.56

  Bortle

  5

• East Worlington

  Direction

  WSW

  Distance (km)

  112.1

  SQM

  21.15

  Bortle

  4