Blackburn Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

18.85

Bortle class

Class 8 (Class 8)

Darkness Quotient

31%

Dataset

August 2026

City sky

Blackburn: The Practical Verdict

Blackburn is a small city in the Blackburn with Darwen region of the United Kingdom, characterised as a suburban setting with significant sky brightness. The stargazing quality here is decidedly poor, with high light pollution limiting visibility to only the brightest celestial objects.

From Blackburn, the Milky Way is obliterated by the city lights. Observing will mostly be restricted to the Moon, planets, and bright stars. Attempting visual deep-sky observing or widefield Milky Way photography will be largely unrewarding. Narrowband imaging may be possible with careful setup, but broadband efforts will struggle against the sky's brightness.

For those seeking darker skies, Rigg End, about 110 kilometers to the south, offers a much improved observational environment. It's worth considering a drive to this site if serious deep-sky observing is desired.

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

Rigg End sits about 112 km south and reaches Bortle 4, roughly 9.1x darker.

Moderate dark window

Blackburn's limiting factor is not only light pollution. Around midsummer, Blackburn 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 Blackburn?

No. Blackburn is a Bortle Class 8 sky with SQM 18.85, 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 Blackburn?

Blackburn is Bortle Class 8 (SQM 18.85), a poor city sky for astronomy.

Is Blackburn good for stargazing?

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

Is Blackburn good for astrophotography?

Broadband deep-sky imaging is heavily compromised from Blackburn and a Bortle 4 or darker site is strongly recommended. Even narrowband imaging is difficult from Blackburn without careful processing.

What can you observe from Blackburn?

Primary targets from Blackburn 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 Blackburn?

The closest meaningfully darker mapped site is Claughton, about 20 km north west of Blackburn, reaching Bortle 5.

When is the sky darkest in Blackburn?

The sky over Blackburn is darkest around January, December. Significant summer limitation: around 80 nights per year have no true astronomical darkness.

Is light pollution in Blackburn getting better or worse?

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

• Claughton

  Direction

  NW

  Distance (km)

  20

  SQM

  20.50

  Bortle

  5

• Bottoms

  Direction

  ESE

  Distance (km)

  23.4

  SQM

  19.94

  Bortle

  6

• Burscough Bridge

  Direction

  SW

  Distance (km)

  27.5

  SQM

  19.83

  Bortle

  6

• Rowantree How

  Direction

  NW

  Distance (km)

  80.6

  SQM

  20.89

  Bortle

  4

• North Stainley with Sleningford

  Direction

  NE

  Distance (km)

  77.2

  SQM

  20.66

  Bortle

  5

• Rigg End

  Direction

  S

  Distance (km)

  112

  SQM

  21.25

  Bortle

  4