Science & Nature
1439 sites
Subcategories:
- Astronomy & Space (396)
- Chemistry (8)
- Earth Sciences (26)
- Biology (79)
- Physics (30)
- Mathematics (59)
- Weather & Climate (104)
- Amateur Radio (682)
- Electronics (47)
https://assa.org.au/
The Astronomical Society of South Australia (ASSA) is an active community organization offering public and member viewing nights, monthly meetings, and astronomy resources for all skill levels. The site features a rich collection of guides covering astrophotography, comets, variable stars, Aboriginal astronomy, and solar system events, plus details on observing sites like Stockport Observatory.
https://www.qsl.net/e2
Electronic Communications 2000 (E-2) is an amateur radio club founded by Jason Foster, now a member of the Foundation for Amateur Radio, with divisions covering topics like radio broadcasting. The site includes club officers, member listings, and news about the club's activities, including a column in the FAR publication AutoCall.
http://theastropages.com/glossary/index.htm
The @stro Pages is a comprehensive amateur astronomy resource featuring a full A-Z glossary of astronomical terms, astrophotos, articles, and an observer's log focused on the San Diego area. With sections covering telescope making, deep-sky objects, and a local astronomy calendar, it serves as a rich hub for stargazers of all experience levels.
![Hurricane Forecast Model Output :: [Main]](/screenshots/26361.webp)
https://web.uwm.edu/hurricane-models/models
Hosted at the University of Wisconsin-Milwaukee, this site by Clark Evans provides hurricane forecast model output for the North Atlantic, Eastern Pacific, and Central Pacific basins. It offers an archive, storm identifiers, shapefiles, KML data, analogs, and verification tools, making it a technical reference for tracking tropical storm activity.
http://discovercircuits.com/
DiscoverCircuits.com, run by engineer Dave Johnson P.E., is a massive repository of over 45,000 free electronic circuits and schematics cross-referenced across 500+ categories for engineers, hobbyists, inventors, and students. Online since 2002, it serves as a go-to reference for quick design ideas, circuit solutions, and component resources covering an enormous breadth of electronic applications.
https://dictionary.obspm.fr/
Created by M. Heydari-Malayeri at the Paris Observatory, this trilingual etymological dictionary covers thousands of astronomy and astrophysics concepts in English, French, and Persian, tracing the roots and definitions of terms from the oldest to the newest. It stands out as a freely accessible, interdisciplinary reference that fills a gap left by conventional astronomical glossaries, with entries organized alphabetically and supplemented by historical and linguistic context.
https://www.qsl.net/n4xy/index.htm
N4XY's personal site covers a wide range of interests centered on ham radio, including QRP, homebrew equipment, boat anchors, RTTY, antennas, and telegraph keys. Beyond radio, the site branches into photography, tropical and marine fish, orchids, ferns, and family, making it a rich window into a dedicated hobbyist's world.
http://dfma.org/
The Durham FM Association (DFMA) is an amateur radio club based in Durham, North Carolina, serving members across the Research Triangle Area with repeaters, monthly meetings, and public service activities. The site covers club events, repeater information, newsletters, ARES/AUXCOMM support, and Field Day activities, making it a central hub for local ham radio enthusiasts.
https://mkas.org.uk/
The Milton Keynes Astronomical Society (MKAS) has been bringing together stargazers in the UK since 1972, offering public observing sessions, fortnightly lectures, astrophotography workshops, and youth programs. Their site features an astro calendar, photo gallery, equipment hire, observing aids, and a live aurora forecast, making it a practical hub for both beginners and experienced astronomers in the region.
https://www.qsl.net/vu2msy/LINKS.htm
Compiled by Sandeep Baruah (VU2MSY/VU2MUE), this page catalogs over 200 ham radio links spanning Indian amateur radio clubs, international organizations like IARU and ARRL, digital communication software, antenna resources, and QRP homebrewing sites. It offers a particularly strong focus on the Indian amateur radio community, including regional clubs in Bangalore, New Delhi, and Gujarat, making it a useful snapshot of the early-2000s ham radio web.