Cambridge Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

19.09

Bortle class

Class 7 (Class 7)

Darkness Quotient

34%

Dataset

May 2026

Suburban/urban transition

Cambridge: The Practical Verdict

Cambridge, a small city in Cambridgeshire with a suburban setting, offers poor conditions for stargazing due to high light pollution levels. With a Bortle class of 7, the urban sky here fails to provide good astronomical quality. The Milky Way is not visible because of the light pollution.

Under these compromised skies, you can easily observe the Moon, planets, bright double stars, and bright open clusters. Narrowband imaging with careful processing may capture some bright nebulae. However, broader deep-sky observing, including reflection nebulae and galaxies, is largely unsuccessful here.

To significantly enhance your stargazing experience, consider travelling to Ashill, about 65 km north-east of Cambridge. It offers a Bortle 4 sky, providing a far better environment for deep-sky observations.

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

Ashill sits about 65 km north east and reaches Bortle 4, roughly 5.6x 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 19.09, 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 19.09), 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 Potton, about 24 km west 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.

• Potton

  Direction

  WSW

  Distance (km)

  23.5

  SQM

  20.54

  Bortle

  5

• Manea

  Direction

  ESE

  Distance (km)

  34.2

  SQM

  20.48

  Bortle

  5

• Bocking Churchstreet

  Direction

  SE

  Distance (km)

  43.9

  SQM

  20.53

  Bortle

  5

• Brent Eleigh

  Direction

  ESE

  Distance (km)

  48.3

  SQM

  20.59

  Bortle

  5

• Hormead

  Direction

  S

  Distance (km)

  30

  SQM

  20.14

  Bortle

  6

• Ashill

  Direction

  NE

  Distance (km)

  65

  SQM

  20.96

  Bortle

  4