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18 October

Ajax Pumpkinville Festival 2025

Ajax's biggest family event of the year comes up on October 18. The Toronto Centre's Durham Region team will be in attendance with tables of crafts for little ghosts and goblins, an information booth, and a number of solar telescopes for safe viewing of the Sun's active sunspots!
15 October
11 October

DDO Astronomy Speaker's Night - October 2025 - The Stunning View from Planet Earth

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

International Observe the Moon Night 2025 (GO for Saturday)

Join us for International Observe the Moon Night to learn about lunar science and exploration, take part in celestial observations, and honor cultural and personal connections to the Moon.
3 October

DDO Astronomy Family Night - October 2025 - It's A Bird, It's A Plane, It's Supermoon!

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!
1 October

Recreational Astronomy Night - October 1, 2025

Join us for our monthly recreational astronomy night meeting. This is where our members get to show their latest projects or give tutorials and tips on just about everything to do with astronomy.
29 September

City Star Party: Bayview Village Park - September 2025 (GO for Monday)

Our monthly City Star Party is the place to catch universe from within the city limits at Bayview Village Park. If you don't have a telescope then you will find many astronomers who would love to share a view.
27 September

Millennium Square Public Star Party - September 26 or 27, 2025 (GO for Saturday)

Join us for an evening of free public stargazing along the north shore of Lake Ontario at Millennium Square.
20 September

DDO Spectacular Saturn - The Ringed Planet at Opposition 2025

Join us for the wonders of astronomy through a presentation on the ring planet Saturn, followed by an age-appropriate celestial activities and a demonstration of the 74” telescope.
20 September

City Star Party: (We are GO for Sept. 20, 2025) Long Branch Park: Fall Equinox

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.
17 September

RASCTO Speaker's Night: Supernova Forensic Files [Online Only]

Join us with Dr. Jennifer Andrews, Associate Astronomer at NOIRLab/Gemini-N, as we explore massive stars, stars at least 8-10 times larger than our Sun, end their lives in some of the brightest explosions in the Universe.
13 September

DDO Astronomy Family Night - September 2025 - Who Really Discovered Neptune?

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!