Science & Nature
1413 sites
Subcategories:
- Astronomy & Space (390)
- Chemistry (7)
- Earth Sciences (24)
- Biology (76)
- Physics (29)
- Mathematics (51)
- Weather & Climate (100)
- Amateur Radio (681)
- Electronics (45)
http://vectorbd.com/sw_review.html
Compiled by John Lloyd (KE4UTX), this site collects shortwave receiver reviews submitted by readers of the Rec.radio.shortwave newsgroup, covering dozens of models from brands like Sony, Grundig, Icom, Kenwood, and Sangean. Each review includes pricing, dimensions, and hands-on user impressions, making it a practical reference for shortwave enthusiasts comparing receivers.
https://ccarc.org.au/
The Central Coast Amateur Radio Club (CCARC) is a community of amateur radio operators and electronics enthusiasts based in Kariong, New South Wales, Australia. The site offers information on repeaters, education for aspiring licensed operators, club news, event calendars, and emergency communications support resources.
http://allthesky.com/
Created by Till Credner and Sven Kohle, AllTheSky.com is a stunning astrophotography gallery spanning comets, nebulae, galaxies, constellations, aurora borealis, and atmospheric phenomena. The site offers an impressive breadth of celestial imagery including nightscapes, 360-degree views, live all-sky feeds, and articles that make it a rich destination for astronomy enthusiasts.
http://atoptics.co.uk/
Atmospheric Optics (atoptics.co.uk) is a comprehensive reference site dedicated to the science of light phenomena in Earth's atmosphere, covering rainbows, halos, glories, coronas, mirages, green flashes, and much more. With an optical phenomenon of the day (OPOD) feature, a blog, and detailed explanations of how sunlight interacts with atmospheric particles, it is an essential resource for anyone curious about the colorful mysteries of the sky.
https://asgh.org/legacy/links.htm
The Astronomical Society of Greenwich Hills (ASGH) maintains this curated links page connecting amateur astronomers to periodicals, regional astronomy clubs, observatories, equipment suppliers, and NASA educational resources. A thorough reference hub for stargazers in Connecticut and New England, it lists dozens of affiliated clubs and organizations alongside tools for both hobbyists and kids.
http://rocklandastronomy.com/
The Rockland Astronomy Club (RAC) is one of the East Coast's premier nonprofit astronomy education organizations, hosting star parties, lectures, dark sky observing sessions, and the renowned Northeast Astronomy Forum (NEAF). Visitors can find event schedules, observing locations at New York state parks, and information about joining a vibrant community of amateur astronomers.
http://users.netonecom.net/~swordman/Radio/unun.htm
Doug's page details the hands-on construction and testing of an impedance-matching transformer (Unun) for connecting a 350-foot long-wire antenna to a shortwave receiver. Complete with photos of the wound toroid core, schematic references, and bandscanning results comparing performance with and without the transformer, it's a practical reference for anyone building receiving antenna accessories.
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://ptri1.tripod.com/
A detailed educational resource dedicated entirely to Pascal's Triangle, covering its construction, history, and the surprising number of patterns hidden within it. Visitors can explore topics ranging from the Fibonacci sequence and Sierpinski fractals to prime numbers and polygonal numbers, with downloadable programs to generate and visualize the triangle's patterns.
https://minnesotasky.tripod.com/
The Steele County Astronomical Society (SCAS) is an Owatonna, Minnesota-based astronomy club affiliated with the Astronomical League, organizing events like Messier Marathons, park viewing nights, and observatory tours. The site lists the club's annual schedule, membership information, and links to the Owatonna Clear Dark Sky Report for planning observation sessions.