Cambridge Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

18.66

Bortle class

Class 8 (Class 8)

Darkness Quotient

29%

Dataset

April 2026

City sky

Cambridge: The Practical Verdict

Cambridge, a small city in Ontario, Canada, faces significant light pollution due to its urban setting. The sky here is rated as Bortle 8, which limits astronomical potential primarily to the brightest celestial objects. The Milky Way is entirely obscured by the city's bright urban sky background.

Observing is constrained to targets such as the Moon, visible planets, and bright stars. Narrowband imaging might be possible with care, focusing especially on brighter nebulae or clusters. However, faint deep-sky objects and the broader structure of the Milky Way remain out of reach. Observing is best directed towards the south-east horizon, where the sky is somewhat darker.

For improved conditions, consider heading to Southwestern Ontario, located about 110 km south. This site offers a significant improvement with a darker Bortle 4 designation, making deep-sky observing more feasible.

At a Glance

Overall

Poor city sky - This is a poor city sky. The Milky Way is not visible and most deep-sky observing is unrealistic from the location itself.

Milky Way

Not visible - The Milky Way is erased by the bright urban sky background.

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

Best nearby upgrade

Southwestern Ontario, Ontario sits about 109 km south and reaches Bortle 4, roughly 7.7x darker.

Good dark window

Cambridge'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 Cambridge?

No. Cambridge is a Bortle Class 8 sky with SQM 18.66, 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 8 (SQM 18.66), a poor city sky for astronomy.

Is Cambridge good for stargazing?

Not for serious deep-sky observing. Cambridge is a poor city 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. Even narrowband imaging is difficult from Cambridge without careful processing.

What can you observe from Cambridge?

Primary targets from Cambridge 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 Cambridge?

The closest meaningfully darker mapped site is Norwich, Ontario, about 38 km south south west of Cambridge, reaching Bortle 5.

When is the sky darkest in Cambridge?

The sky over Cambridge is darkest around January, December.

Is light pollution in Cambridge getting better or worse?

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

• Norwich, Ontario

  Direction

  SSW

  Distance (km)

  37.9

  SQM

  20.37

  Bortle

  5

• Puslinch, Ontario

  Direction

  ENE

  Distance (km)

  23.7

  SQM

  19.56

  Bortle

  7

• Southwestern Ontario, Ontario

  Direction

  SSE

  Distance (km)

  74.4

  SQM

  20.27

  Bortle

  6

• Southwestern Ontario, Ontario

  Direction

  S

  Distance (km)

  108.5

  SQM

  20.87

  Bortle

  4

• Golden Horseshoe, Ontario

  Direction

  E

  Distance (km)

  59.7

  SQM

  19.75

  Bortle

  6