Springfield Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

18.38

Bortle class

Class 8 (Class 8)

Darkness Quotient

26%

Dataset

April 2026

City sky

Springfield: The Practical Verdict

Springfield, situated in Illinois, is classified as a small city with suburban surroundings and suffers from high light pollution. The overall quality of astronomical observation from here is poor, with the Milky Way completely erased by the city’s bright background sky.

The best targets for stargazing include the Moon, planets, and bright stars, with narrowband imaging efforts requiring extra care due to the high illumination levels. However, deep-sky visual observing and broad nebulae imaging are not feasible. The cleanest horizon lies towards the north-west but does not significantly improve conditions.

For darker skies, a limited upgrade is possible by heading north-west to 15517, Illinois, roughly 115 km away. While not dramatically darker, the site offers a slight improvement with a Bortle 5 classification, suitable for broader imaging and accessing fainter celestial objects.

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

15517, Illinois is the strongest nearby option but remains Bortle 5; the improvement is real but modest.

Good dark window

Springfield'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 Springfield?

No. Springfield is a Bortle Class 8 sky with SQM 18.38, 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 Springfield?

Springfield is Bortle Class 8 (SQM 18.38), a poor city sky for astronomy.

Is Springfield good for stargazing?

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

Is Springfield good for astrophotography?

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

What can you observe from Springfield?

Primary targets from Springfield 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 Springfield?

The closest meaningfully darker mapped site is Twin Hill, Illinois, about 53 km south south west of Springfield, reaching Bortle 6.

When is the sky darkest in Springfield?

The sky over Springfield is darkest around January, December.

Is light pollution in Springfield getting better or worse?

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

• East 100 North Road, Illinois

  Direction

  SE

  Distance (km)

  59.4

  SQM

  20.38

  Bortle

  5

• Twin Hill, Illinois

  Direction

  SSW

  Distance (km)

  53.4

  SQM

  20.20

  Bortle

  6

• Gabbert Road, Illinois

  Direction

  SSW

  Distance (km)

  14

  SQM

  19.10

  Bortle

  7

• 589, Illinois

  Direction

  SW

  Distance (km)

  78

  SQM

  20.51

  Bortle

  5

• 15517, Illinois

  Direction

  NW

  Distance (km)

  115.9

  SQM

  20.73

  Bortle

  5