Astronomy & Space
396 sites
http://aoas.org/
AOAS (Amateur Observers' Astronomical Society) is a club website for astronomy enthusiasts, likely featuring meeting information, observing events, and resources for stargazers. The domain and structure suggest a regional astronomy club serving members interested in telescopes, sky-watching, and community observing sessions.
http://rivastro.org/index.php
The Riverside Astronomical Society (RAS) has been serving Southern California astronomy enthusiasts since 1957, offering star parties, public outreach, monthly meetings with professional astronomers, and access to their dark sky site GMARS in Landers, CA. The site features event calendars, member resources, sky cameras, weather data, and information about their annual Nightfall star party event.
https://members.wolfram.com/jeffb/poster/poster.html
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.
https://spacew.com/
Solar Terrestrial Dispatch is a 36-year-old space weather service offering near real-time auroral activity mosaics, solar wind data, X-ray flux readings, and experimental flare prediction heatmaps updated every two minutes. Visitors can track geomagnetic conditions, monitor the electrical power grid demand, and view stunning satellite imagery of aurora activity over both hemispheres.
https://astrosystems.biz/
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.
http://faqs.org/faqs/space
The faqs.org Space Index is a comprehensive archive of Usenet FAQs dedicated to astronomy and space topics, covering everything from acronyms and data sources to how to become an astronaut and controversial space questions. Maintained across dozens of indexed documents, it serves as a structured reference hub for space enthusiasts and researchers seeking archived FAQ documents from the early internet era.
http://astrophysical.org/
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.
https://skywatch.brainiac.com/astroland
Uncle Rod Mollise's Astro Land is a long-running amateur astronomy hub hosted at 'Chaos Manor South,' packed with telescope guides, equipment reviews, CCD and webcam imaging tips, and resources for Schmidt-Cassegrain telescope users. Rod also runs the Mobile Astronomical Society and offers a free Used CAT Buyer's Guide, making this a genuinely useful stop for backyard astronomers of all levels.
http://virtualcolony.com/sac
The Deep Sky Database is an online observing list generator for amateur astronomers, drawing on the Saguaro Astronomy Club's meticulously maintained databases to help users search for galaxies, nebulae, star clusters, double stars, asterisms, and more. Built on decades of collaborative contributions from club members, it offers searchable access to well-known catalogs including Messier, Caldwell, Herschel 400, and Herschel 2500 objects, making it a practical planning tool for backyard stargazers.
https://affy50.tripod.com/Eyepcalc.html
An interactive eyepiece calculator for amateur astronomers that computes magnification and true field of view based on telescope focal length and aperture. It includes a comprehensive built-in database of eyepieces from major brands like Celestron, Meade, Pentax, Vixen, and Zeiss, plus support for custom eyepiece data entry.