Richmond Hill Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

17.92

Bortle class

Class 9 (Class 9)

Darkness Quotient

22%

Dataset

April 2026

Inner city sky

Richmond Hill: The Practical Verdict

Richmond Hill is a suburban small city in Ontario, located just north of Toronto. The sky here displays high light pollution levels, making it a challenging environment for stargazing, with the Milky Way completely obscured. The major challenge arises from the city lights and the glow from Toronto to the south, affecting broad visibility.

The best targets from Richmond Hill include the Moon, bright planets, double stars, and certain solar system phenomena. Narrowband imaging is possible but not ideal with such high background sky brightness, and visual deep-sky observing is not a viable pursuit. The cleanest views are bias towards the north-west direction, marginally escaping the urban light domes to the south.

For those seeking darker skies, Mattawan in Ontario, to the east-north-east, provides a significant improvement in sky quality, offering Bortle class 3 conditions and better access to deep-sky objects. It's worth the trip for dedicated observers.

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

Mattawan, Ontario sits about 284 km east north east and reaches Bortle 3, roughly 23x darker.

Good dark window

Richmond Hill'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 Richmond Hill?

No. Richmond Hill 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 Richmond Hill?

Richmond Hill is Bortle Class 9 (SQM 17.92), a severe urban sky for astronomy.

Is Richmond Hill good for stargazing?

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

Is Richmond Hill good for astrophotography?

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

What can you observe from Richmond Hill?

Primary targets from Richmond Hill 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 Richmond Hill?

The closest meaningfully darker mapped site is East Gwillimbury, Ontario, about 34 km south of Richmond Hill, reaching Bortle 7.

When is the sky darkest in Richmond Hill?

The sky over Richmond Hill is darkest around January, December.

Is light pollution in Richmond Hill getting better or worse?

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

• East Gwillimbury, Ontario

  Direction

  S

  Distance (km)

  33.6

  SQM

  19.54

  Bortle

  7

• Town of Oakfield, New York

  Direction

  SE

  Distance (km)

  128.8

  SQM

  20.64

  Bortle

  5

• Mattawan, Ontario

  Direction

  ENE

  Distance (km)

  283.5

  SQM

  21.33

  Bortle

  3