Cambridge Stargazing & Astronomy Report
Light pollution and stargazing locations near Cambridge
- City
- Cambridge
- Country
- Canada
- Latitude
- 43.3600
- Longitude
- -80.3133
Key Sky Quality Metrics
- SQM (mag/arcsec²)
- 18.69
- Bortle class
- Class 8 (Class 8)
- Darkness Quotient
- 30%
- Dataset
- May 2026
City sky
Cambridge: The Practical Verdict
Cambridge, a small city in Ontario, lies under high light pollution, resulting in a poor city sky. The overall verdict is that stargazing here is not ideal, particularly due to a heavily illuminated night sky that washes out finer details.
The Milky Way is completely erased, limiting observations to brighter celestial objects. You can realistically expect to observe the Moon, planets, and bright stars. Double stars and solar system events remain visible, and with care, narrowband imaging might capture the brightest nebulae.
While local conditions limit what is observable, nearby Blandford-Blenheim, about 25 km south south west, offers a modest improvement with slightly darker skies. However, don't expect a dramatic difference.
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
- Limited nearby upgrade
- Blandford-Blenheim, Ontario is the strongest nearby option but remains Bortle 5; the improvement is real but modest.
- 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 18.69, 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 18.69), 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 Troy, Ontario, about 13 km south east of Cambridge, reaching Bortle 6.
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?
Long-term light pollution over Cambridge has been broadly stable across the available measurements.
north - fair
A faint diffuse glow on the north horizon. Stars are visible to low elevation, with minor losses near the ground.
north-north-east - fair
The north-north-east sky is broadly dark with a small amount of glow at the horizon. Most objects in this direction are accessible.
north-east - fair
A trace of skyglow near the north-east horizon. Stars are clear throughout this direction except very close to the ground.
east-north-east - good
Dark horizon to the east-north-east. Faint stars and extended objects in this direction behave much as they do overhead.
east - good
The east sky is dark to the horizon. Faint targets are accessible at all elevations here.
east-south-east - good
Dark sky in the east-south-east direction with no obvious skyglow. Suitable for faint-object work at low elevation.
south-east - good
Dark horizon to the south-east. Faint stars and extended objects in this direction behave much as they do overhead.
south-south-east - good
The south-south-east sky is dark to the horizon. Faint targets are accessible at all elevations here.
south - good
Dark horizon to the south. Faint stars and extended objects in this direction behave much as they do overhead.
south-south-west - good
Dark sky in the south-south-west direction with no obvious skyglow. Suitable for faint-object work at low elevation.
south-west - good
The south-west horizon is dark. Faint stars are visible close to the ground.
west-south-west - good
No noticeable light pollution to the west-south-west. The sky in this direction is dark to the horizon.
west - fair
The west sky is broadly dark with a small amount of glow at the horizon. Most objects in this direction are accessible.
west-north-west - marginal
Noticeable glow on the west-north-west horizon. Stars below about 20 degrees in this direction are dimmed.
north-west - marginal
A diffuse glow sits on the north-west horizon. Faint objects below 20 degrees in this direction are compromised.
north-north-west - fair
A faint diffuse glow on the north-north-west horizon. Stars are visible to low elevation, with minor losses near the ground.
zenith - marginal
The overhead sky background is high. Bright stars and planets are clear; faint stars are suppressed.
-
Troy, Ontario
- Direction
- SE
- Distance (km)
- 13.1
- SQM
- 20.09
- Bortle
- 6
-
Blandford-Blenheim, Ontario
- Direction
- SSW
- Distance (km)
- 26.2
- SQM
- 20.36
- Bortle
- 5
-
Everett, Ontario
- Direction
- NNE
- Distance (km)
- 97.7
- SQM
- 20.34
- Bortle
- 5
-
Ashtabula County, Ohio
- Direction
- SSW
- Distance (km)
- 134.3
- SQM
- 20.42
- Bortle
- 5
-
Niagara County, New York
- Direction
- E
- Distance (km)
- 105.5
- SQM
- 19.99
- Bortle
- 6