Skip to main content
31 May

David Dunlap Observatory 90th Anniversary Star Party

Free,self-guided tours of the DDO resume 1-5 PM on May 31st, the 90th anniversary of the RHDDO!
1 May

[AstroTours] Fast Radio Bursts: Cosmic Fireworks Light up the Universe

Check out the May AstroTour! May AstroTours features Ayush, a 5th year PhD candidate in the Department of Astronomy and Astrophysics at the University of Toronto and an NSERC Canada Graduate Scholar about fast radio bursts, followed by exciting astronomy demos and telescope tours!
31 May

City Star Party: Long Branch Park - MOON IN JUNE - May 31st or June 1st 2025 and June 7th or June 8th 2025

We are piloting a new City Star Party at Long Branch Park to catch universe from within the city limits. If you don't have a telescope then you will find many astronomers who would love to share a view.
21 May

RASCTO Speaker's Night: The James Webb Space Telescope: a cosmic story for the ages [Online Only]

Join us as Ethan R. Siegel, Ph.D., explores the James Webb Space Telescope.
3 May

DDO Global Star Party for International Astronomy Day! 2025

Join us for a world-wide live stream of events from here and from around the world hosted from the David Dunlap Observatory!
29 June

DDO: Sunday Sungazing - June 2025

Safely observe the sun with us! During these family-friendly sessions, a DDO Astronomer will answer your questions about our closest star: the sun!
14 June

DDO Astronomy Family Night - June 2025 - Constellations: Connecting the Dots

Families will be introduced to the wonders of astronomy through a presentation on a variety of exciting astronomy topics, followed by age-appropriate celestial activities!
7 June

DDO Astronomy Speaker's Night - Seeing Double (Stars) - June 2025

Experience a presentation led by astronomy experts and researchers and tour the observatory.
25 May

DDO: Sunday Sungazing - April 2025

Safely observe the sun with us! During these family-friendly sessions, a DDO Astronomer will answer your questions about our closest star: the sun!
11 April

DDO Astronomy Speaker's Night - What's Inside a Rocky Planet? - April 2025

Experience a presentation led by astronomy experts and researchers and tour the observatory.