Hamilton Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

17.92

Bortle class

Class 9 (Class 9)

Darkness Quotient

22%

Dataset

August 2026

Inner city sky

Hamilton: The Practical Verdict

Hamilton, a mid-sized city in Ontario, offers sky conditions heavily influenced by urban lighting. As a location with high light pollution, the night sky is severely affected, and the Milky Way is completely absent. This city's urban density places substantial limits on stargazing opportunities, with only the brightest astronomical objects reliably visible.

While the inner city sky makes visual deep-sky observation unfeasible, it is possible to enjoy the Moon, planets, and bright stars. Narrowband imaging can function, but only with care, and broader targets like galaxies are best avoided. The north-north-east horizon is particularly bright, with the southern view offering slightly clearer conditions.

For those seeking darker skies, travelling to Dewittville, New York, approximately 120 km to the south-south-east, provides a meaningful improvement. This nearby location boasts significantly less light pollution, making it a recommended destination for serious observers keen on deeper sky work.

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

Dewittville, New York sits about 120 km south south east and reaches Bortle 4, roughly 19x 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 17.92, 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 17.92), 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 Hamilton, Ontario, about 19 km north west of Hamilton, reaching Bortle 6.

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.

• Hamilton, Ontario

  Direction

  NW

  Distance (km)

  19.2

  SQM

  19.77

  Bortle

  6

• Dewittville, New York

  Direction

  SSE

  Distance (km)

  120.2

  SQM

  21.09

  Bortle

  4

• Dean Richmond, Pennsylvania

  Direction

  S

  Distance (km)

  107.5

  SQM

  20.47

  Bortle

  5

• Southwestern Ontario, Ontario

  Direction

  W

  Distance (km)

  180.8

  SQM

  20.43

  Bortle

  5