Astronomy & Space
396 sites
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.
http://astroa.physics.metu.edu.tr/bigeyes.html
A comprehensive reference table listing the world's largest optical telescopes, compiled by Bill Arnett and hosted at Middle East Technical University's physics department. Each entry includes the telescope's aperture, name, geographic coordinates, altitude, and technical notes, making it a handy quick-reference for astronomy enthusiasts and researchers.
https://avastronomyclub.org/
The Antelope Valley Astronomy Club (AVAC) is a nonprofit organization founded in 1982 to share the wonders of the night sky with families in northeastern Los Angeles County. Members range from beginners to advanced observers, and the club offers monthly meetings, school presentations, observing programs, and resources like telescope guides and DSO observing lists.
https://people.ast.cam.ac.uk/~jds
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'.
https://enchantedlearning.com/subjects/astronomy/glossary/index.shtml
Zoom Astronomy from EnchantedLearning.com is a comprehensive astronomy glossary and educational reference covering terms from A to Z, with illustrated definitions of concepts like aberration of light, aphelion, asteroids, and more. Aimed at K-12 students and teachers, the site includes printables, worksheets, and detailed pages on the solar system, stars, comets, and notable astronomers.
https://clavius.org/
Moon Base Clavius is a thorough, well-organized resource dedicated to debunking Apollo moon landing conspiracy theories, drawing on contributions from both amateurs and professionals. Visitors will find detailed analyses of Apollo photographs, environmental conditions, technology, space vehicles, and the logical fallacies underpinning hoax claims.
http://kstrom.net/isk/stars/starmenu.html
Created by Paula Giese, this richly detailed site explores Native American and Aboriginal astronomy, covering Lakota star knowledge, sacred star maps, medicine wheels as solar-stellar observatories, and indigenous constellation traditions. It serves as an educational hub with links to Lakota theology, archaeoastronomy, star stories, and teacher resources for native-centered science curricula.
https://nrao.edu/pr/2000/vla20/background
A commemorative background page from the National Radio Astronomy Observatory celebrating the VLA radio telescope's first twenty years of scientific discovery, covering breakthroughs from Mercury's icy poles to gravitational lenses and gamma ray bursts. Packed with links to research highlights, aerial photos, visitor information, and introductory radio astronomy materials, it serves as both a historical record and an educational gateway to one of the world's most powerful telescopes.
http://jgiesen.de/welcomeEnglish.htm
A rich hobbyist resource by J. Giesen featuring an extensive collection of Java and JavaScript applets covering astronomy topics like sun and moon phases, planet positions, sundials, Venus transits, and satellite observation. Visitors will also find physics quizzes, chaos and fractal simulations, color theory tools, and links to books and software, making it a deep interactive playground for science enthusiasts.
https://go-astronomy.com/astro-club-search.htm
GO ASTRONOMY hosts a comprehensive directory of over 600 amateur astronomy clubs across all 50 U.S. states, plus international listings spanning countries from Japan to Germany. Visitors can search by state to find local clubs offering meetings, star parties, viewing nights, and stargazing programs, making it an essential starting point for anyone wanting to connect with fellow astronomers.