Astronomy & Space
390 sites
https://gaac.us/
The Gloucester Area Astronomy Club (GAAC) is a casual, no-dues astronomy group founded in 2003 that meets monthly at the Lanesville Community Center in Gloucester, Massachusetts. The site features member photo galleries, ephemerides, aurora alerts, object rise/set times, and a calendar of events for anyone curious about the night sky.
https://moonconnection.com/
MoonConnection.com is a comprehensive lunar reference covering moon phases, eclipses, Apollo missions, tides, and the moon's gravitational effects, complete with interactive tools and a monthly phases calendar. It also offers practical guides on fishing, hunting, and night photography by moon phase, plus companion mobile apps for tracking lunar cycles on the go.
http://pretoria-astronomy.co.za/
The Pretoria Centre of the Astronomical Society of Southern Africa serves both amateur and professional astronomers interested in the unique southern hemisphere skies, offering membership, newsletters, observing events, and deep-sky imaging resources. Visitors can find comet reports, lunar eclipse photography, nebula images, telescope-making tips, and guides to the ASSA 100 deep-sky objects list.
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://nic.funet.fi/pub/astro/html/astro-uk.html
Hosted on the Finnish University and Research Network (FUNET), this is the national homepage for amateur astronomy in Finland, maintained by members of the Ursa Astronomical Association. It organizes links to Finnish astronomical clubs, research institutions, schools, planetaria, publications, and observation resources, reflecting a country with one of the highest per-capita rates of amateur astronomers in the world.
https://princetonastronomy.org/
The Amateur Astronomers Association of Princeton (AAAP) is the official web presence for a New Jersey-based astronomy club bringing together hobbyists and enthusiasts to observe and explore the night sky together. Visitors can expect to find club meeting information, observing events, and resources for amateur stargazers of all experience levels.
https://astronomy-links.net/twocomets.html
Clark M. Thomas offers a detailed analysis of comet imaging techniques, comparing amateur astrophotographer Damian Peach's stunning wide-field ISON image against the professional Subaru telescope's shot of Comet Lovejoy. The article makes a compelling case for tracking background stars rather than the comet itself, arguing that the resulting sharp stellar fields and visible deep-sky objects produce the most visually rewarding comet photographs.
https://ing.iac.es/Astronomy/telescopes/int
The official site for the Isaac Newton Telescope (INT), a major optical telescope operated by the Isaac Newton Group of Telescopes on La Palma in the Canary Islands. Visitors can explore telescope instruments, apply for observing time, access data archives, check object visibility tools, and browse publications from this working research facility.
http://stellar-database.com/scale.html
A concise educational page from stellar-database.com that walks readers through the mind-bending scale of the universe, from the Earth's diameter out to the edge of the known cosmos. It explains astronomical units, light-years, and parsecs with precise conversion figures, making vast cosmic distances tangible and comparable.
http://parallaxinstruments.com/
Parallax Instruments, Inc. is a small business founded in 1991 that manufactures precision astronomical telescopes, German equatorial mounts, rotating tube rings, aluminum tubing, and observatory piers. Their product lineup includes large-aperture Newtonians, Dall-Kirkham Cassegrains, and custom-built instruments crafted in a fully equipped machine shop for serious amateur and professional astronomers.