Rising and setting times of the Sun and Moon
- Sunrise/sunset calculator by the National Research Council Canada
- Web-based server from the U.S. Naval Observatory (Washington, D.C.)
Eclipses of the Sun and Moon
The NASA/Goddard Space Flight Center eclipse website is arguably THE reference about eclipses. Contains maps and detailed predictions.
- Eclipses of the Sun and Moon for the upcoming years
- All solar eclipses from -1999 to +3000
- All lunar eclipses from -1999 to +3000
Where and when to look to see the International Space Station (ISS), Iridium satellite flares, etc.
- Heavens-Above.com, a site hosted by the German Space Agency's Space Operations Centre (DLR/GSOC), produces detailed visibility predictions for any place on Earth (text and maps):
- Visibility of artificial satellites from Montréal, Québec City, Trois-Rivières and Ottawa.
- Create your own personalized start page and get custom predictions for your favourite observing sites.
- NASA's predictions for passes of the International Space Station (text only).
Solar activity and aurora borealis
- Space Weather Canada
- Spaceweather.com provides a daily follow-up on solar activity, and issues warnings when the probability of auroral displays is high; includes beautiful photo galleries.
- Space Environment Center: real-time data about solar and geomagnetic activity.
Is your favourite observing site really dark?
- Check out this interactive map of light pollution (in French).
Will the stars be visible tonight?
- Weather forecast for astronomy (Numerical simulations produced by the Canadian Meteorological Centre — CMC)
- Attila Danko's Clear Sky Charts (synoptic graphs based on CMC's data): Montréal, Quebec City, Trois-Rivières, Saguenay, Ottawa/Gatineau
- Environment Canada's weather forecasts
- Satellite and radar images.