Celebrating 90 years of discovery and exploration, the RHDDO has inspired generations with its breathtaking views of the cosmos. As a national attraction and treasured educational facility, the RHDDO has brought the wonders of the universe closer to countless visitors, sparking imaginations and igniting a passion for astronomy.
Join us for a weekend-long celebration of recognizing nine decades of celestial discovery, community engagement and a bright future of astronomical adventure. Come explore the stars with us and see how far we’ve come!
- Saturday, May 31, 1 – 5 p.m. Tour the RHDDO
- Saturday, May 31, 8:30 – 11 p.m. Stargazing Party
- Sunday, June 1, 1 – 5 p.m. Tour the RHDDO
- Sunday, June 1, 9 – 11 p.m. Happy 90th Birthday David Dunlap Observatory!
For more information, please visit the City of Richmond Hill website.
Richmond Hill Historical Society 