Richmond Hill Stargazing & Astronomy Report

Key Sky Quality Metrics

SQM (mag/arcsec²)

17.99

Bortle class

Class 9 (Class 9)

Darkness Quotient

23%

Dataset

May 2026

Inner city sky

Richmond Hill: The Practical Verdict

Richmond Hill is a small city within Ontario, positioned just north of Toronto. The sky quality here is heavily impacted by high light pollution, making it a severe urban environment for stargazing. Observing conditions are largely dictated by this light pollution, which limits much of what can be seen overhead.

From Richmond Hill, practical observational targets are primarily the Moon, planets, and bright stars, alongside double stars and solar system events. Narrowband imaging might be possible with careful setup, but deep-sky targets are poorly visible and the Milky Way is completely absent. Brightest nebulae in narrowband and bright open clusters are possible but challenging.

The better alternative lies in Southwestern Ontario, about 210 km west south west. While this offers some improvement with its Bortle 5 sky, it won't transform your experience substantially, and careful consideration of local glare and transparency will play a significant role.

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

Limited nearby upgrade

Southwestern Ontario, Ontario is the strongest nearby option but remains Bortle 5; the improvement is real but modest.

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 17.99, 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 17.99), 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 Sharon, Ontario, about 23 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.

• Newton Robinson, Ontario

  Direction

  NW

  Distance (km)

  33.1

  SQM

  19.90

  Bortle

  6

• Sharon, Ontario

  Direction

  S

  Distance (km)

  22.8

  SQM

  19.45

  Bortle

  7

• Ridgelea Heights, New York

  Direction

  SE

  Distance (km)

  101

  SQM

  20.35

  Bortle

  5

• Southwestern Ontario, Ontario

  Direction

  WSW

  Distance (km)

  208.1

  SQM

  20.73

  Bortle

  5