RASC Toronto Centre

RASC Toronto Centre We are the Toronto Centre of the Royal Astronomical Society of Canada. Many of our events are open to the general public.

We love astronomy and have been sharing the wonders of the night sky with the public for over 140 years. We host a number of monthly events where members and non-members alike can come out and do astronomy. From our monthly professional and amateur talks at the Ontario Science Centre, to our Dark Sky Star Parties or our City Star Parties, come out and take a look through a telescope, and meet people who love space.

for this week, with worldwide content. Clear skies! (image by Chris Vaughan)
06/07/2026

for this week, with worldwide content. Clear skies! (image by Chris Vaughan)

This simulated image shows the waning crescent moon at 4 am Eastern Time on Tuesday, June 9, 2026. You will only see the moon lit this way if you are up and outside during the wee hours of the morning after third quarter every month. Familiar features are being lit from the opposite direction than w...

for this week, with worldwide content. Clear skies! (image by Claudio Oriani)
05/31/2026

for this week, with worldwide content. Clear skies! (image by Claudio Oriani)

This image of Messier 13, the Great Globular Star Cluster in Hercules was imaged by my friend Claudio Oriani in Richmond Hill, Ontario on May 30, 2023 using an 8″ SCT telescope. The cluster, also known as NGC 6205, is 24,000 light-years away from our sun. The cluster appears as a faint fuzzy patch...

for this week, with worldwide content. Clear skies! (image by NASA LRO)
05/24/2026

for this week, with worldwide content. Clear skies! (image by NASA LRO)

This image of the Lunar Straight Wall or Rupes Recta in Mare Nubium was captured by the Lunar Reconnaissance Orbiter. While the feature can be seen through binoculars, a backyard telescope will reveal more detail. (Adapted from NASA LRO)

05/23/2026

We are calling a NO-GO for the Millennium Square and Long Branch Star Party today Saturday May 23 due to weather and strong winds! We'll try again next time! Clear Skies!

Here are this week's best International Space Station flyovers for Toronto and the GTA. Just look up and see it moving!
05/23/2026

Here are this week's best International Space Station flyovers for Toronto and the GTA. Just look up and see it moving!

As shown above, on Sunday, May 24, 2026 from 9:18 pm to 9:24 pm EDT, the International Space Station will be visible flying high overhead of southern Ontario in an extremely bright pass, rising over the west-northwestern horizon near Venus and Jupiter and then flying past the bright star Arcturus be...

05/22/2026

We are calling a NO-GO for the Millennium Square Star Party today Friday May 22 due to persistent clouds! We'll try again tomorrow! Clear Skies!

05/21/2026

We are calling a GO for the Bayview City Star Party today Thursday, May 21! See everyone at sunset! Clear Skies!

05/20/2026

Join us tomorrow evening with Dr. Jesse Rogerson, Associate Professor at York University, as he explores the fascinating world of interstellar comets visiting our solar system!

05/18/2026

Due to forecasted thunderstorms, the Bayview City Star Party scheduled for May 18 and 19 is a NO-GO. We’ll try again Thursday if conditions improve. Clear skies!

for this week, with worldwide content. Clear skies! (image by Fred Espenak)
05/17/2026

for this week, with worldwide content. Clear skies! (image by Fred Espenak)

This beautiful image of Gemini’s Messier 35 and the smaller, but denser open star cluster NGC 2158 (below right of centre) was captured by “Mr. Eclipse” himself, the late great Fred Espenak. Two more small open clusters shine at the far right – squint to see them! The image spans two thumb w...

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