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Upcoming & Recent Events

18 November

Speaker's Night: The Current State of Water on Mars

Mars was once a much warmer and wetter world, more similar to Earth than the cold polar desert we see today. But water still persists in various forms on Mars! Dr. Tanya Harrison, a "Professional Martian," will discuss how scientists keep discovering water on Mars, and what implications it might have for life.
20 November

RHDDO Spectacular Saturn - "Saturn Big and Bright

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.
28 November

RHDDO Astronomy Family Night - November 2026 - An Icy Alignment

Families will see a presentation on a variety of exciting astronomy topics, followed by age-appropriate celestial activities.

FEATURED NEWS

CAO Spring 2026 Work Party

The Spring Work Party was held at the E.C. Carr Astronomical Observatory (CAO) on Saturday, 2 May. Members of the CAO Committee were joined by other members of the Toronto Centre as well as 7 volunteers from the David A.

Main Telescope at the CAO Upgraded

During the Spring Work Party from May 2nd - 3rd, the control system on the the main telescope in the Geoff Brown Observatory was upgraded to a new technology platform (MKS 6000 control system). This mini-project involved:

Next Speaker and Social Night at the RHDDO - May 20th

On May 20th the Toronto Centre will be hosting a simulcast of our Speaker's Night at the historic David Dunlap Observatory in Richmond Hill followed by a s

Winter Access at the CAO

The Carr Observatory is open this winter on a limited basis as follows:

About us

Welcome to the Toronto Centre of the Royal Astronomical Society of Canada. We’re Canada’s largest astronomy club with more than 600 members in the GTA who share a love of astronomy and the wonders of the night sky

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The Sky Tonight

Toronto

 Astronomical forecasts for different locations in the GTA and a monthly, free star map.