David Dunlap Observatory

David Dunlap Observatory in Richmond Hill is an astronomical facility featuring a 74-inch reflector telescope that remains the largest permanently installed telescope in Canada. The building was designed to house this major instrument and accommodate visitors during public observing nights when they can explore celestial objects.

The facility opened in 1935 with funding from David Dunlap's widow and leadership from Clarence Chant. Over the following decades it evolved into a major research center that produced groundbreaking discoveries about the cosmos.

The observatory serves as a gathering place where visitors connect with the cosmos and experience the wonder of the night sky firsthand. Public observing sessions bring together people who share a passion for discovering what lies beyond our world.

Visitors can join public observing sessions during open times to look through various telescopes and explore celestial objects. It is worth checking ahead for session times, as these vary by season and depend on clear skies for viewing.

The observatory building with its striking architecture has been featured in several television and film productions including NBC's Hannibal and Netflix's The Umbrella Academy. Its distinctive shape and historic appearance make it a recognizable backdrop for filmmakers.

Location: Richmond Hill

Inception: 1935

Official opening: May 31, 1935

Elevation above the sea: 224 m

Address: 123 Hillsview Drive

Website: http://astro.utoronto.ca/DDO

GPS coordinates: 43.86300,-79.42270

Latest update: December 7, 2025 20:41