- AstroDay
 - Astronomy Day celebration held annually at the Prince Kuhio Plaza in Hilo, Hawaii, that introduces the public to the wonders of astronomy. - Astronomical League: Astronomy Day
- Official site for Astronomy Day, a grass roots movement designed to share the joy of astronomy with the general population every spring and fall. Lists activities held around the U.S. in May and October.
- Astronomy Day - Royal Astronomical Society of Canada
- Royal Astronomical Society of Canada lists Astronomy Day events across Canada.
- Astronomy Day: Bringing Astronomy to the People
- Discusses the significance and origins of the day celebrating astronomy and provides information about the Sky & Telescope Astronomy Day Awards.
- Clay Center Observatory Astronomy Day
- Clay Centre for Science and Technology hosts its annual Astronomy Day with the Amateur Telescope Makers of Boston (ATMoB). Located at the Dexter and Southfield Schools in Brookline, MA.
- Colorado Astronomy Day
- Dedicated to promoting public education and interest in astronomy and to the importance of maintaining dark skies for public access to, and enjoyment of, the night sky.
- International Astronomy Day
- Lists the Royal Astronomical Society of Canada's events at the Royal British Columbia Museum and Dominion Astrophysical Observatory.
- Meade Instruments Celebrates National Astronomy Day
- Lists star parties and astronomy events where star-gazers can win a Meade telescope and Astronomy magazine prizes.
- NOVAC Astronomy Day
- Astronomy Day event sponsored by Northern Virginia Astronomy Club and held at C.M. Crockett Park in Fauquier County, Virginia, all you need is an interest in the wonders of the cosmos to attend.
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