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://qsl.net/wa5mc
The Atchafalaya Amateur DX Association Inc. (AADXA) is a ham radio club based in Amelia, Louisiana, with a full organizational presence including officer listings, membership applications, meeting minutes, newsletters, and repeater information. Developed by Guy R. Morrison (WA5MC), the site also features field day photos, a guestbook, and club constitution documents, making it a solid hub for local amateur radio enthusiasts.
http://azastronomy.com/
Richard D. Jacobs, M.D. shares his CCD astrophotography captured from his backyard in Chandler, Arizona, showcasing diffuse nebulae, galaxies, star clusters, planetary nebulae, and solar system objects despite significant light pollution. The site also covers the technical side of amateur CCD imaging including astrometry, spectroscopy, and photometry, making it a useful resource for urban amateur astronomers.
![en:start [Skychart]](/screenshots/15841.webp)
https://ap-i.net/skychart//en/start
Skychart, also known as Cartes du Ciel, is a free open-source planetarium program that lets users draw detailed sky charts using star and nebula catalogs while also displaying the positions of planets, asteroids, and comets. This multilingual wiki serves as the official documentation and download hub for the software, supporting Linux, Windows, and macOS with both stable and beta releases.
http://lundybirds.blogspot.com/
The Lundy Bird Observatory Sightings Archive is a long-running blog documenting bird and wildlife observations from Lundy Island, now preserved as a historical archive after migrating to a new site in late 2023. Years of detailed sighting reports, species updates, and passage records make it a rich resource for birdwatchers and naturalists interested in this unique Atlantic island.
https://cobaltpet.blogspot.com/
Run by a Northern California hobbyist known as 'weatherall', this blog chronicles shortwave and mediumwave radio listening with detailed reception reports, SIO signal quality codes, station identifications, and portable receiver reviews. Covering international broadcasters, number stations, utility signals, NDB logs, and DXing tips, it's a thorough record of the hobby for fellow shortwave enthusiasts.
http://seboldt.net/k0jd
K0JD's Ham Homebrew Site is a personal amateur radio page by the operator behind the callsign K0JD, focused on homebrewing radio equipment and DIY ham radio projects. The frames-based layout is a classic hallmark of old-web personal pages dedicated to the ham radio hobby.
http://polarimage.fi/
A Finnish sky photography site dedicated to atmospheric phenomena including aurora borealis and noctilucent clouds captured from the high latitudes of Finland. Visitors will find striking images of both day and night skies showcasing some of nature's most dramatic light displays.
http://hawastsoc.org/
The Hawaiian Astronomical Society, founded in 1949, is a non-profit club dedicated to promoting amateur astronomy across the Hawaiian Islands, hosting regular public and members-only star parties at locations like Dillingham Airfield, Kahala Community Park, and Geiger Community Park. The site features event schedules, a deep-sky atlas, an astronomy newsletter, school star party programs, and live solar and lunar data feeds.
http://jap.hu/electronic/rf.html
Peter's RF schematics page is a technical reference collection of radio frequency circuit diagrams spanning receivers, transmitters, and transceivers across a wide range of frequencies from 27MHz to 1GHz. Hobbyists and engineers will find schematics for superregenerative receivers, FM audio transmitters, walkie-talkies, SAW-based designs, and datasheets for chips from major manufacturers like Silicon Labs, HopeRF, and Texas Instruments.
http://neofoundation.org/astrolabe
The Astrolabe Astronomy Club is a local amateur astronomy club based in Wheeling, WV, offering information on membership, meetings, and events for stargazing enthusiasts. Created by Pat Plunkett, this early-2000s club site serves as a community hub for sky watchers in the West Virginia area.