Hamilton Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

17.78

Bortle class

Class 9 (Class 9)

Darkness Quotient

21%

Dataset

May 2026

Inner city sky

Hamilton: The Practical Verdict

Hamilton, a mid-size city in Ontario, offers stargazers a sky heavily impaired by urban light pollution. The severity of this inner city sky results in the Milky Way being completely invisible and only the brightest celestial bodies, such as the Moon and planets, piercing the veil of light.

From this urban location, the most practical targets remain the Moon, bright planets, and the occasional solar system event. Observers interested in double stars or narrowband imaging of bright targets can still engage their telescopes, but deep-sky enthusiasts will find the city's light pollution a substantial barrier. Visual deep-sky observing is unfeasible here, as is observing broad expanses of the Milky Way or faint meteor showers.

For those seeking a significant improvement, Rockdale Township in Pennsylvania, about 160 km south, promises darker, clearer skies conducive to deep-sky exploration. It's worth considering this location for a more immersive astronomical experience.

At a Glance

Overall

Severe urban sky - This is a severely light-polluted urban sky. Only the Moon, planets, bright stars, and a few specialist targets remain practical.

Milky Way

Not visible - The Milky Way is not visible from this sky.

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

Rockdale Township, Pennsylvania sits about 159 km south and reaches Bortle 4, roughly 17x darker.

Good dark window

Hamilton'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 Hamilton?

No. Hamilton is a Bortle Class 9 sky with SQM 17.78, 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 Hamilton?

Hamilton is Bortle Class 9 (SQM 17.78), a severe urban sky for astronomy.

Is Hamilton good for stargazing?

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

Is Hamilton good for astrophotography?

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

What can you observe from Hamilton?

Primary targets from Hamilton 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 Hamilton?

The closest meaningfully darker mapped site is Lynden, Ontario, about 22 km west of Hamilton, reaching Bortle 7.

When is the sky darkest in Hamilton?

The sky over Hamilton is darkest around January, December.

Is light pollution in Hamilton getting better or worse?

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

• Lynden, Ontario

  Direction

  W

  Distance (km)

  22

  SQM

  19.46

  Bortle

  7

• Southgate, Ontario

  Direction

  NNW

  Distance (km)

  100.6

  SQM

  20.16

  Bortle

  6

• Rockdale Township, Pennsylvania

  Direction

  S

  Distance (km)

  158.9

  SQM

  20.84

  Bortle

  4

• Southwestern Ontario, Ontario

  Direction

  WSW

  Distance (km)

  201.2

  SQM

  20.42

  Bortle

  5