Access Richmond Hill
The Access Richmond Hill Contact Centre provides assistance for general inquiries, responds to questions or concerns regarding programs and services as well as accepts in person payments.
Contact Us
905-771-8800
Hours of Service:
Monday through Friday, 8:30 a.m. to 4:30 p.m.
Report Feedback
Report a problem with a service, e.g. missed garbage collection, overnight parking, potholes, street lights, etc.
Richmond Hill David Dunlap Observatory
The Richmond Hill David Dunlap Observatory (RHDDO), designated under the Ontario Heritage Act and a national historic designation, is proudly owned by the City of Richmond Hill.
An iconic park and facility located at 123A Hillsview Drive, plans are underway for the transformation of the RHDDO property into a unique destination park through the RHDDO Master Plan. We are currently working on the first phase of the Master Plan and details are available here.
The RHDDO first opened in 1935 and was at the forefront of Canadian astronomical research. Learn more about its history and achievements at the site, including advances in radio astronomy and the first direct evidence that Cygnus X-1 was a black hole. Today, the RHDDO is continuing its heritage as a facility for public education and outreach through City-run programs and partnerships.
It is also a popular site for film, television and advertising production.
Planning your visit
Free self-guided tours of the Administration Building and Observatory Dome
Drop by Richmond Hill's very own national historic site to visit the Administration Building and the Observatory Dome that houses Canada's largest telescope. While you are there, visit our gift shop and purchase a souvenir.
Please note: This self-guided tour does not include live demonstrations or viewing through the telescope. Access to the buildings on site for more in-depth and guided tours is available through advance registration through the Astronomy Series programs and/or booking group tours and private programs.
