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://www.qsl.net/k9ona
The Six Meter Club of Chicago (SMCC) is a Chicago-area amateur radio club promoting activity across HF, VHF, and UHF bands, with a focus on six-meter operations, emergency communications, and community radio services. The site lists 2020 meeting dates, net schedules including a Tuesday ragchew net on 50.130 MHz USB, a Two Meter FM Info Net, and a Thursday Digital SSTV net using EasyPal software.
https://solarpower.guide/
Bob Robertson's hobby site is a sprawling reference on solar power, covering everything from basic definitions and how solar panels work to educational guides for kids and van-life solar setups. With dozens of articles on renewable energy topics, it reads like a one-man encyclopedia built by a retiree passionate about the subject.
https://projectrho.com/starmap.html
Winchell Chung (aka Nyrath the nearly wise) maintains this ambitious 3-D starmap project dedicated to the golden age of science fiction and real astronomical data. Inspired by E.E. 'Doc' Smith's classic space operas, the site blends scientific accuracy with a deep love of the stars to create interactive three-dimensional maps of nearby stellar neighborhoods.
https://life.itu.int/radioclub
The official site of 4U1ITU, the International Amateur Radio Club operating under the callsign of the International Telecommunication Union in Geneva, covering club history, QSL info, and notable operations. Highlights include Earth-Moon-Earth (EME) contacts, a historic material collection spanning 60 years of club activity, and expeditions like the ITU team's operation from Mont Blanc.
https://ik3qar.it/rtty/1
IK3QAR's technical page covers RTTY digital radio operation, focusing on FSK and AFSK interface circuits with detailed wiring diagrams for connecting a PC soundcard to a transceiver. The site addresses practical problems like ground loop interference and signal reentry, offering schematics and tips for rigs including the Kenwood TS940.
http://australiasevereweather.com/
Maintained by storm chasers Michael Bath and Jimmy Deguara, Australia Severe Weather is a comprehensive archive of severe weather photography, storm chasing reports, tornado and waterspout pictures, and tropical cyclone tracking maps covering Australian weather events. With over 35,000 photographs, timelapse webcam videos, flood history records, and storm chasing news, it serves as a serious reference for anyone fascinated by extreme Australian weather.
https://dra73.org/
The Delaware Repeater Association (DRA) is a ham radio club founded in 1973 that maintains repeaters across Delaware and holds quarterly in-person meetings at the Route 40 Diner in Bear, DE with a Zoom option for remote members. The site covers club membership, dues, leadership, meeting schedules, and links to regional amateur radio resources including ARES groups and VE testing.
https://repeater-builder.com/
Repeater Builder is a dedicated resource for amateur radio enthusiasts focused on building, modifying, and maintaining repeater systems. The site dives into the technical side of ham radio infrastructure, making it a go-to reference for hobbyists who want to construct or upgrade their own repeaters.
https://lcwo.net/
LCWO.net, created by Fabian Kurz (DJ5CW), is a comprehensive web-based platform for learning Morse code (CW) using the Koch method, with interactive exercises, progress tracking, and a global community of learners. The site features user highscores, forums, user groups, and multilingual support across dozens of languages, making it a go-to resource for ham radio operators worldwide.
https://kasonline.org/astroweb.html
The Kalamazoo Astronomical Society's curated astronomy link directory groups hundreds of carefully selected web resources into subject categories, from amateur telescope making and astrophotography to planetary exploration and dark-sky parks. Organized like a yellow pages phone book, this extensive collection makes it easy for both beginners and seasoned stargazers to find the best astronomy sites on the web.