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Welcome to the Allan I. Carswell Astronomical Observatory

The James Webb Space Telescope (JWST) is shown moving along its orbit at L2 (Lagrange Point 2, about 1 million miles away from Earth). January 15, 2023: AICO, Sunna Withers, Zena Khadour

2024 Solar Eclipse, Read the AICO events and eclipse information!

2023 in Review, Read the Directors Newsletter out Now!

Located on the York University campus in Toronto, Canada, the Allan I. Carswell Observatory supports student learning and research and is a hub for public engagement and outreach. It is home to a one-metre telescope – the largest telescope on a university campus in all of Canada – and a 60-centimetre Cassegrain, both equipped with state-of-the-art electronic cameras. As well, the Observatory has five 20-centimetre telescopes available for outdoor viewing during special celestial events.

The Observatory offers a variety of free programming for the public, including public viewing sessions, group tours, our online radio show, online public viewing, and more.

Upcoming Events

All About the AICO

Observatory crew member and York Undergraduate Dorsa Ahmadieh describes the observatory operations.

New Observatory Domes at York University Will Improve Night Sky Viewing

Watch the installation of our new Observatory domes that arrived in 2022.

Tour the Original Domes

Interested to see what the original 1960s domes at the Allan I. Carswell Observatory looked like? Take a 360 degree virtual tour.


Explore images taken by our telescope, from seasonal objects to solar system galleries.

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