McMaster University Planetarium
McMaster University Planetarium supports CAAO.
Organized by the Canadian Association of Amateur Astronomers (CAAA).
CAAO 2027: tentatively mid-March · Online · One day
Students may write CAAO for experience even if they do not meet the eligibility requirements for international representation. Selection to represent Canada at IOAA Junior or IOAA is a separate process and requires meeting the applicable eligibility and selection criteria.
Students write the national examination online in one day, usually in mid-March.
The top 20–25 students are invited to an in-person camp with several days of training.
Camp participants take the Team Selection Test at the end of the in-person training camp.
TST results determine medal awards and the selection of Team Canada. International eligibility is also required.
Selected Team Canada members continue training during the summer to prepare for IOAA.
Explore Astronomy Picture of the Day, featuring astronomy imagery and an explanation of the science behind it.

APOD archive image
Stickney Crater
HiRISE, MRO, LPL (U. Arizona), NASA