2026-07-07 Astrophotography for the Amateur The companion website to Michael A. Covington's book 'Astrophotography for the Amateur,' published by Cambridge University Press, covering film astrophotography, CCD imaging, and image processing. Visitors can browse a picture gallery of Covington's own astrophotos, download free astrophotography software, and find corrections and updates to the book.
2026-07-07 Astrophysical - Scientific popularization - Istituto Scientia Astrophysical.org is a scientific popularization site run by Istituto Scientia, covering astrophysics and astronomy with sections on stars, magnitude, an online planetarium, and the SAO star catalog. Visitors can explore topics from stellar spectral classification to cosmology, with links to companion site Astrometry.org for celestial mechanics content.
2026-07-07 Astrosystems home page AstroSystems is a Colorado-based manufacturer selling telescope kits, accessories, and components including their signature TeleKit truss tube Dobsonians, secondary mirrors, laser collimators, and digital setting circles. With worldwide shipping and a broad catalog spanning fast f/ratio optics to dew removal systems, this site is a go-to resource for amateur telescope makers and Dobsonian enthusiasts.
2026-07-07 Astroverde - Astronomers of Verde Valley - Amateur astronomy club in Northern Arizona Astroverde is the official website of the Astronomers of Verde Valley, an amateur astronomy club based in Northern Arizona's Verde Valley region. Visitors can browse member astrophotography galleries, find star party schedules, access observing tools, and learn how to join the club.
2026-07-07 Atlas coelestis Hosted by the Library of the Department of Astronomy in Bologna, this scholarly site guides visitors through a curated collection of historic celestial atlases spanning the 16th through 18th centuries, from Piccolomini's Renaissance star maps to Bode's Uranographia. Created by Davide Neri, a philosopher and physicist, it beautifully bridges the history of science and art through some of the most celebrated astronomical cartography ever published.
2026-07-07 AuroraWatch UK · AuroraWatch UK AuroraWatch UK is a free alert service run by scientists at Lancaster University's Space and Planetary Physics group, notifying users when the aurora borealis might be visible from the UK. The site offers real-time magnetogram plots, activity stackplots, a map, and multi-channel alerts via email, Twitter, Telegram, and more.
2026-07-07 Australian Amateur Astronomy - IceInSpace IceInSpace is the largest online amateur astronomy community in the Southern Hemisphere, serving over 20,000 registered members across Australia, New Zealand, and South America. The site features astronomy forums, equipment reviews, DIY projects, astrophotography galleries, event reports, and an astronomy glossary tailored to southern hemisphere observers.
2026-07-07 AutoStakkert! – AutoStakkert!4 Stacking Software – Lucky Imaging with an Edge – Emil Kraaikamp – AS!2, AS!3, AS!4 AutoStakkert! is free lucky imaging software created by Emil Kraaikamp for automatically analyzing, aligning, and stacking planetary and solar images captured through a telescope via high-speed video. The site offers downloads of multiple software versions (AS!2 through AS!4), sample images of Jupiter, Mars, and the Moon, and guides demonstrating how the stacking algorithm dramatically sharpens noisy astrophotography footage.
2026-07-07 BAA Comet section The British Astronomical Association Comet Section is a dedicated resource for tracking newly discovered comets, periodic comets, and observational reports from contributors worldwide. Maintained by director Nick James and visual observations coordinator Jonathan Shanklin, the site features comet ephemerides, discovery news, observing guides, and an archive of the newsletter 'The Comet's Tale'.
2026-07-07 Barnard-Seyfert Astronomical Society - Nashville, Tennessee The Barnard-Seyfert Astronomical Society (BSAS) is a Nashville, Tennessee astronomy club that hosts regular public star parties, member meetings, and educational events at local parks and nature centers. Visitors can find event schedules, membership information, a member-produced wall calendar featuring astrophotography, and resources for amateur astronomers including discounted access to the Observer's Handbook.
2026-07-07 BBAA | Home The Back Bay Amateur Astronomers (BBAA) is a non-profit astronomy club serving the Hampton Roads, Virginia area, dedicated to public outreach and bringing stargazing to the community since 1978. The site offers event calendars, observing programs, a photo gallery, telescope donation info, scholarships, and archives of newsletters and eclipse coverage.
2026-07-07 BCAS|Home 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.
2026-07-07 Berfield.com – amateur astronomy, video games, profressional and family information for Scott Berfield Scott Berfield's personal homepage covers his passion for amateur astronomy and CCD imaging alongside video game production and family history for the West Coast Berfields. The astronomy and CCD content takes top billing in the meta description and keywords, making it the site's defining draw for stargazers and hobbyist imagers.
2026-07-07 Berks County Amateur Astronomical Society The Berks County Amateur Astronomical Society (BCAAS) is a Pennsylvania-based astronomy club hosting monthly meetings, star parties, and online AstroHangouts via Zoom for space enthusiasts. The site features clear sky clocks for local observing sites including Pulpit Rock Astronomical Park and Carpenter Observatory, plus a club newsletter called Pegasus.
2026-07-07 Bill Snyder Astrophotography Bill Snyder's astrophotography site showcases an extensive gallery of deep-sky images including nebulae, galaxies, and star clusters captured from his personal and shared observatories in Pennsylvania. The collection includes several NASA Astronomy Picture of the Day (APOD) winners and is organized into detailed categories covering narrowband, RGB, and HaRGB imaging techniques.
2026-07-07 BinoSky A guide to astronomy with binoculars.: BinoSky, created by Benjamin Crowell, is a comprehensive guide to stargazing with binoculars, organizing the best celestial objects to observe by region of sky and season. Visitors will find detailed entries on open clusters, globular clusters, nebulae, and galaxies visible through binoculars, complete with sky maps and a data table compiled by SEDS contributor Hartmut Frommert.
2026-07-07 Blackbird Observatory and Instruments R. Jay GaBany's Blackbird Observatory page details the technical setup behind his acclaimed astrophotography work, including a half-meter Ritchey-Chretien telescope, professional CCD cameras, and two remote observatory locations in New Mexico and the California Sierra Nevada. The site is a fascinating window into serious amateur deep-sky imaging, covering instrumentation, elevation advantages, and the evolution of the observatory from 2005 through 2014.
2026-07-07 Bluegrass Amateur Astronomy Club - Bluegrass Astronomy Club, Lexington KY - Home The Bluegrass Amateur Astronomy Club is a community astronomy group based in Lexington, Kentucky, that holds monthly meetings and stargazing sessions at Raven Run Nature Sanctuary from March through November. The site offers club news, a beginner's section, a photo gallery, and sky charts for local observers, welcoming families and newcomers to the hobby.
2026-07-07 bortle dark sky scale A detailed reference page explaining the Bortle Dark Sky Scale, which measures night sky light pollution across nine categories from inner-city skies to pristine darkness. The site includes an adapted table of Bortle's indicators with color codes used in light pollution maps, plus five star charts covering key sky areas visible from the continental United States.
2026-07-07 Brian Koberlein Brian Koberlein is an astrophysicist and author who writes accessible, research-based blog posts covering topics like black holes, dark matter, solar flares, and planetary formation. The site serves as a hub for his ongoing science communication work, with an archive of posts and a newsletter for readers who want regular cosmic updates.
2026-07-07 Bright Supernova Bright Supernova, maintained by David Bishop, is a dedicated tracking resource for bright supernovae observations and images. This redirect page points to a larger archive at RochesterAstronomy.org, suggesting a substantial collection of supernova data and imagery for amateur and professional astronomers alike.
2026-07-07 C/2006 P1 (McNaught) Gary W. Kronk's Cometography provides a detailed scientific profile of Comet C/2006 P1 (McNaught), covering its discovery, orbital calculations, and observer reports from around the world. The page includes historical highlights of the comet's brightness predictions, perihelion data, and observation logs with magnitudes and coma measurements, along with photographs taken at Paranal Observatory.
2026-07-07 C14 Is Awesome! Stephen Saber, an amateur astronomer, shares deep-sky observing lists, lunar phenomena like Saber's Beads, and stargazing tips on this enthusiast blog. Catalogued targets from the Messier, Caldwell, RASC, and Herschel 400 lists make it a practical resource for marathon observers hunting NGC objects.
2026-07-07 C2A - Planetarium Software C2A is a feature-rich planetarium software created by Philippe Deverchere, designed for both amateur and professional astronomers who need precise astrometric and photometric capabilities. The site documents the software's extensive support for star catalogues including Hipparcos, Tycho-2, and UCAC4, as well as deep sky object catalogues, asteroid and comet tracking, and tools for predicting occultations and sunrise/sunset times.
2026-07-07 Canada - 1972 July 10 Total Solar Eclipse - Interactive Google Map - Xavier Jubier Xavier Jubier's interactive Google Map documents the path of the July 10, 1972 total solar eclipse over Canada, offering precise geographic visualization of the totality corridor. Part of a larger solar eclipse resource site by Jubier, this page is a valuable reference for eclipse chasers and astronomy enthusiasts researching historical eclipse paths.
2026-07-07 Canadian Astronomy Data Centre The Canadian Astronomy Data Centre (CADC) is an official Government of Canada research facility that archives and provides access to astronomical data for scientists and researchers. Hosted by the National Research Council of Canada, it serves as a centralized repository for observational astronomy data collections.
2026-07-07 Capella Observatory Capella Observatory documents an amateur astronomical observatory situated atop the Kupferberg in Namibia, near Windhoek, offering a rare southern-hemisphere observing perspective. The site features astrophotography and deep sky observations including nebulae, globular clusters, and open star clusters captured with a 60cm telescope.
2026-07-07 CAS Online The Calumet Astronomical Society (CAS) maintains this site for their Indiana-based astronomy club, featuring information about the Conway Observatory, a monthly star chart, open house schedules, and meeting details at the Munster Library. Members and stargazers can find membership applications, donation options, and a photo gallery documenting the club's history and activities.
2026-07-07 Cataclysmic Variable Stars Modern Astronomy in Motion: A detailed educational presentation on cataclysmic variable stars (CVs), covering binary star systems, accretion disks, novae, polars, and outburst phenomena with artist renditions and real observational data. Created by Jeff B. and hosted on Wolfram Research servers, the site features light curves, spectra, and telescope images from Lowell Observatory's 31-inch NURO telescope.
2026-07-07 Cataloghi di galassie An extensive galaxy catalog reference compiled by the Circolo Astrofili Talmassons (C.AS.T.), an Italian astronomy club, featuring member-photographed images organized across major catalogs including NGC, UGC, IC, PGC, Messier, and VCC. The site covers thousands of galaxies alongside deep sky objects, quasars, and galaxy clusters, making it a remarkable visual archive built collaboratively since 1996.