Richard Powell's Atlas of the Universe uses a sequence of increasingly enormous maps to place the Solar System, Milky Way, nearby galaxies, superclusters, and the visible universe into one understandable scale.
Ed Ting's Scope Reviews has been reviewing telescopes since 1997, building a long-running independent reference around more than 100 telescopes, eyepieces, beginner advice and equipment rankings.
John Walker's Your Sky turns a browser into an interactive planetarium, generating sky maps, horizon views and virtual-telescope plots for arbitrary dates, locations and celestial objects.
Carl Sabanski's mySundial.ca and Sundial Primer turn gnomonics into a deep practical reference covering dozens of sundial types, design geometry, corrections, templates, charts, and construction tools.
Graphite Galaxy preserves hands-on amateur telescope material, including observing notes, equipment projects, collimation tools, optical alignment, and DIY accessories built from inexpensive materials instead of purchased as finished astronomy products.
Henning Umland's CelNav site preserves a compact guide to celestial navigation with tutorials, freeware, links, and a homepage whose visitor counter dates back to May 1997.
Astronomy Picture of the Day has been edited by Robert Nemiroff and Jerry Bonnell since 1995, building a daily archive of annotated astronomy images alongside a hand-built subject index covering stars, galaxies, nebulae, planets, observatories, spacecraft, scientists, and astronauts.
Fred Espenak's MrEclipse photography guide spans film and digital techniques for lunar eclipses, including wide-angle shots, star trails, multiple exposures, telephoto work, exposure tables, focal-length planning, and the Danjon brightness scale.
Phil Plait's Bad Astronomy is an early web archive of astronomy misconceptions, media errors, conspiracy claims, and pseudoscience rebuttals built long before online fact-checking became a recognizable publishing category.
NASA Goddard's StarChild site has taught astronomy to children since 1996 using two reading levels, activities, glossaries, graphics, and the wonderfully direct structure of an early educational website.
The University of Maryland's Solar System Collisions tool, online since the late 1990s, lets students vary impactor size, speed, composition, and target while studying crater size, energy, earthquakes, and impact frequency.
SpaceWeather.com has tracked solar flares, auroras, sunspots, geomagnetic storms, fireballs, and near-Earth asteroids since the late 1990s, preserving a daily scientific news format that still feels like the classic web.
Eclipse '98 documented a 1998 Caribbean solar-eclipse webcast built from more than 700 files, a dozen servers, static HTML, CGI, FTP distribution, and a volunteer team learning web-scale failure in real time.
Jerry Oltion's personal site mixes decades of science-fiction writing with homemade telescopes, astronomy projects, sundials, workshop notes, repaired Volkswagens, and the kind of deep hobby pages personal websites do best.
The Australian Space Academy is a surviving independent science-education site packed with astronomy notes, courses, reference material, observation exercises, space-law resources, and old-school institutional ambition.
NASA's Astronomy Picture of the Day archive began in June 1995 and still exposes decades of astronomy outreach as a giant chronological list of ordinary web links.
The Millennium Simulation Project paired one of the largest cosmology computations of its era with a brutally practical web page full of DivX movies, giant images, PostScript posters, and downloadable galaxy catalogues.
Martin J. Powell's NakedEyePlanets.com combines current visibility tables, finder charts, planetary appearance, observing history and naked-eye astronomy into a long-running hand-built reference.
Big Ear's website preserves all 13 issues of Cosmic Search, the pioneering 1979-1982 SETI magazine, including a 1981 Isaac Asimov essay on possible non-Earth-like biochemistry.
NASA still hosts pages from POLAR, a late-1990s and early-2000s experiment that searched for large-scale polarization in the cosmic microwave background with a ground-based microwave radiometer.