Cambridge Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

19.15

Bortle class

Class 7 (Class 7)

Darkness Quotient

35%

Dataset

July 2026

Suburban/urban transition

Cambridge: The Practical Verdict

Cambridge, a small city situated in Cambridgeshire, bears the hallmarks of high light pollution characteristic of urban areas. The stargazing quality here is decidedly poor due to the artificial lighting in the vicinity, rendering the Milky Way and other faint celestial targets invisible.

The immediate sky over Cambridge lends itself primarily to observations of the Moon, planets, and bright double stars. These targets hold up well perhaps due to the ease of seeing bright objects against the ambient light. While deep-sky observing is not viable, narrowband imaging of bright nebulae can still be pursued, albeit with careful processing.

For those seeking a more fulfilling deep-sky experience, heading to Burgate east north-east of Cambridge offers a Bortle 4 sky, which dramatically improves visibility of fainter objects. This upgrade path is the most meaningful nearby, providing conditions suitable for more serious astronomy.

At a Glance

Overall

Poor urban/suburban sky - This is a poor sky for astronomy. The Moon, planets, and a few bright objects remain viable, but deep-sky work is difficult.

Milky Way

Not visible - The Milky Way is not realistically visible from this level of light pollution.

Best targets from here

Moon, planets, bright double stars, bright open clusters, narrowband imaging with careful processing

Do not prioritise

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

Best nearby upgrade

Burgate sits about 63 km east north east and reaches Bortle 4, roughly 5.1x darker.

Moderate dark window

Cambridge's limiting factor is not only light pollution. Around midsummer, Cambridge loses true astronomical darkness entirely, so deep-sky observing and imaging are strongly seasonal. Plan serious sessions around the darker months.

Frequently Asked Questions

Can you see the Milky Way from Cambridge?

No. Cambridge is a Bortle Class 7 sky with SQM 19.15, 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 Cambridge?

Cambridge is Bortle Class 7 (SQM 19.15), a poor urban/suburban sky for astronomy.

Is Cambridge good for stargazing?

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

Is Cambridge good for astrophotography?

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

What can you observe from Cambridge?

Primary targets from Cambridge include Moon, planets, bright double stars, bright open clusters, narrowband imaging with careful processing. Targets such as visual deep-sky observing, broadband galaxies, reflection nebulae are not realistic from this sky.

Where are darker skies near Cambridge?

The closest meaningfully darker mapped site is Ashwell, about 23 km south west of Cambridge, reaching Bortle 5.

When is the sky darkest in Cambridge?

The sky over Cambridge is darkest around January, December. Significant summer limitation: around 66 nights per year have no true astronomical darkness.

Is light pollution in Cambridge getting better or worse?

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

• Ashwell

  Direction

  SW

  Distance (km)

  23.4

  SQM

  20.49

  Bortle

  5

• Welney

  Direction

  NNE

  Distance (km)

  34.6

  SQM

  20.59

  Bortle

  5

• Brent Eleigh

  Direction

  ESE

  Distance (km)

  48.1

  SQM

  20.72

  Bortle

  5

• Bocking Churchstreet

  Direction

  SE

  Distance (km)

  43.4

  SQM

  20.59

  Bortle

  5

• Brent Pelham

  Direction

  S

  Distance (km)

  28

  SQM

  20.13

  Bortle

  6

• Burgate

  Direction

  ENE

  Distance (km)

  63.4

  SQM

  20.92

  Bortle

  4