City of Richmond Hill

  • Drone shot of the David Dunlap Observatory

    Plan Your Trip!

    The Richmond Hill David Dunlap Observatory (RHDDO) opened in 1935 and is located at 123A Hillsview Drive. A number of important studies have taken place here and you can learn more before you visit.

  • Child looking through telescope chalk drawings

    Mars Madness

    Join us for the chance to see Mars at its very best this January, when Earth will pass closest to the planet Mars! Find other upcoming events too.

  • RHDDO Dome and Administrative Building

    Ongoing Projects

    The RHDDO Park Master Plan sets out a vision for the future enhancement, management and programming of the RHDDO Park, including woodlot restoration.