Astronomy & Space
396 sites
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.
http://skymaps.com/
Skymaps.com, created by Kym Thalassoudis, offers free monthly sky maps and star charts in PDF format to help amateur and professional skywatchers explore constellations, planets, and comets. The site also features a curated store with planispheres, star atlases, telescopes, and astronomy books for all skill levels.
https://inter-sol.org/
The INTER-SOL Programme (ISP), run by Volkssternwarte Paderborn e.V. in Germany, is an international citizen science initiative coordinating daily sunspot observations by amateur and professional astronomers since 1977. The site offers fundamentals about the sun, methods of sunspot counting and registration, an observers network, photo galleries, and INTER-SOL data archives, all presented in both English and German.
https://skyhound.com/sh/dso_guide.html
Skyhound's Guide to Deep Sky Objects is a comprehensive reference covering every major category of deep sky objects, from open star clusters and globular clusters to quasars and gravitational lenses. Each section explains what the objects are, how they appear through a telescope, and highlights notable examples like the Veil Nebula, Einstein's Cross, and the Pleiades.
https://tas-online.org/
The Tacoma Astronomical Society is a non-profit astronomy club based in the Tacoma region, offering public observing nights, general meetings, outreach events for local schools, and an active student group for preschool through high school age participants. The site serves as a hub for club news, event calendars, a photo gallery featuring member astrophotography, and resources for amateur astronomers of all experience levels.
https://apod.nasa.gov/apod/archivepix.html
The legendary NASA Astronomy Picture of the Day archive is a comprehensive chronological index linking to thousands of daily astronomy images spanning from 1995 to the present, each accompanied by expert explanations written by professional astronomers. Featuring entries on nebulae, planets, eclipses, star clusters, and deep-sky objects, this archive is an endlessly explorable treasure trove for anyone fascinated by the cosmos.
https://asteroidoccultation.com/
Steve Preston's long-running resource provides predictions for asteroid occultation events, listing when asteroids will pass in front of stars as seen from Earth. Covering upcoming events through 2026 with supplementary observation guides and FAQs, it serves as a reference for amateur and professional astronomers tracking these brief but scientifically valuable phenomena.
https://eclipse.gsfc.nasa.gov/SEgoogle/SEgoogle2001/SE2017Aug21Tgoogle.html
Fred Espenak's NASA Eclipse Website hosts an interactive Google Maps tool showing the precise path of totality for the August 21, 2017 total solar eclipse, including central line, northern and southern limits, and 10-minute interval markers. Hosted by NASA's Goddard Space Flight Center, the page provides detailed data on greatest eclipse, greatest duration, lunar limb profiles, and eclipse weather resources.
http://astronautix.com/
Encyclopedia Astronautica is a massive reference work by Mark Wade covering the complete history of human spaceflight, with over 79,000 pages on rockets, spacecraft, astronauts, cosmonauts, launch sites, and engines from every spacefaring nation. Spanning Soviet secret programs to cancelled American spacecraft, it is one of the most comprehensive space history archives ever assembled on the web.
https://astronomyonline.org/
Built by a legally blind photographer and astronomer, Astronomy Online is a comprehensive resource covering topics from astrophotography and the solar system to cosmology, astrobiology, and exoplanets. The site includes observation guides, a worksheet library for teachers, software recommendations, and an image gallery, making it a remarkable contribution from someone who created it despite a significant physical disability.