Cambridge Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

19.03

Bortle class

Class 7 (Class 7)

Darkness Quotient

33%

Dataset

April 2026

Suburban/urban transition

Cambridge: The Practical Verdict

Cambridge is a compact university city in Cambridgeshire with a rich intellectual heritage and numerous historical landmarks. The suburban light pollution results in severely compromised night skies, limiting serious astronomy opportunities. This is not a destination for dark-sky enthusiasts.

The Milky Way is entirely invisible from Cambridge, and observing faint nebulae or galaxies is not practical due to skyglow. However, brighter astronomical targets like the Moon, planets, and open clusters remain viable, particularly for visual observations. For astrophotography, narrowband imaging might still yield results with dedicated processing.

For darker skies, Mellis provides Bortle 4 conditions and lies around 65 km to the east-north-east. This site offers significantly better sky quality for deep-sky observing and is worth the trip if more ambitious targets are sought.

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

Mellis sits about 66 km east north east and reaches Bortle 4, roughly 5.8x 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 19.03, 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 19.03), 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 Stortford Fields Eastern Neighbourhood, about 34 km south of Cambridge, reaching Bortle 6.

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?

There is not yet enough long-term data to give a confident trend for Cambridge.

• Manea

  Direction

  E

  Distance (km)

  34.1

  SQM

  20.53

  Bortle

  5

• Bocking Churchstreet

  Direction

  SE

  Distance (km)

  43

  SQM

  20.57

  Bortle

  5

• Brent Eleigh

  Direction

  ESE

  Distance (km)

  49.7

  SQM

  20.65

  Bortle

  5

• Stortford Fields Eastern Neighbourhood

  Direction

  S

  Distance (km)

  33.8

  SQM

  20.24

  Bortle

  6

• Mellis

  Direction

  ENE

  Distance (km)

  66

  SQM

  20.94

  Bortle

  4

• Raunds

  Direction

  WNW

  Distance (km)

  45.3

  SQM

  20.40

  Bortle

  5