Astronomy & Space
396 sites
http://icstars.com/HTML/SolarSection/HAlpha/OBSERVINGTHESUNHAlpha1.html
David Knisely's comprehensive H-Alpha handbook covers solar observation in remarkable technical depth, with dedicated sections on prominences, sunspot group classification, solar flares, and a full glossary of H-Alpha terminology. Part of the larger ICSTARS Astronomy site, this resource is a serious reference for amateur astronomers interested in observing the sun through hydrogen-alpha solar filters.
http://blackcanyonastronomy.com/
The Black Canyon Astronomical Society (BCAS) is an amateur astronomy club serving Western Colorado, offering public meetings, star parties, dark sky preservation efforts, and outreach programs to schools and community groups. The site features a calendar of events, astrophotography gallery, observing highlights, and information on joining the Astronomical League.
https://oasi.org.uk/
The Orwell Astronomical Society Ipswich (OASI) is a UK-based astronomy club centered at the historic Orwell Park Observatory in Suffolk, welcoming everyone from casual stargazers to dedicated amateurs with specialist observing and telescope-building skills. The site features upcoming lecture events and Zoom talks, member observing reports, a newsletter archive, comet guides, and a rotating gallery of impressive astrophotography captured by members.
http://satobs.org/iridium.html
A detailed reference page dedicated to Iridium satellite flares, covering why and how these spectacular visible reflections occur, flare prediction tools, orbital data, and launch history. It features one of the earliest known photographs of an unpredicted Iridium flare, observation reports, and an extensive directory of related resources for satellite observers.
https://flemingastrophotography.com/
Neil Fleming's astrophotography showcase specializes in deep-sky imaging using the Meade DSI CCD camera, capturing galaxies, nebulae, and star clusters. The site highlights work done with high-end equipment including an NP-127 refractor and NJP mount, making it a compelling destination for amateur astronomers interested in CCD imaging techniques.
https://ing.iac.es/Astronomy/telescopes/int
The official site for the Isaac Newton Telescope (INT), a major optical telescope operated by the Isaac Newton Group of Telescopes on La Palma in the Canary Islands. Visitors can explore telescope instruments, apply for observing time, access data archives, check object visibility tools, and browse publications from this working research facility.
http://jgiesen.de/GeoAstro/GeoAstro.htm
Juergen Giesen's GeoAstro Applet Collection offers more than 65 interactive Java applets for tracking the precise positions of the sun, moon, and planets, including sundials, moon phases, eclipse data, and sky maps for any location on Earth. Featured in Sky & Telescope magazine and honored with the Griffith Observatory Star Award, this site is a remarkable labor of love for amateur and professional astronomers alike.
http://cbat.eps.harvard.edu/index.html
The Central Bureau for Astronomical Telegrams (CBAT), hosted at Harvard University since 1966, is the official IAU clearinghouse for announcing new astronomical discoveries including comets, novae, supernovae, and other transient celestial events. Visitors can browse online IAU Circulars, subscribe to discovery feeds, explore lists of supernovae and comets, and learn how to submit their own astronomical observations.
https://gb.nrao.edu/~rmaddale/Education/OrionTourCenter/index.htm
Created by Ronald J. Maddalena of the National Radio Astronomy Observatory, this interactive tour guides visitors through the Orion constellation using five images captured at different wavelengths including optical, infrared, and radio. Visitors can explore astronomical objects in Orion, learn the mythology behind the hunter, take a glossary-supported test, and see how the same region of sky looks dramatically different depending on the telescope used.
http://atlasoftheuniverse.com/
Created by Richard Powell, this stunning educational site presents nine nested maps of the universe, each roughly ten times the scale of the previous, zooming out from the nearest stars to the entire visible universe 14 billion light years away. Multilingual and richly illustrated, it offers a rare sense of cosmic scale that makes abstract astronomical distances genuinely comprehensible.