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://up-ship.com/Book/spaceshipdesign.htm
A work-in-progress book project aimed at giving science fiction authors and scriptwriters the real engineering and physics knowledge needed to design plausible spacecraft. The site outlines chapter topics ranging from propulsion systems and structures to weapons and re-entry, covering everything from chemical rockets to theoretical Alcubierre warp drives.
https://in-the-sky.org/
Created by Dominic Ford, In-The-Sky.org is a richly detailed astronomy portal offering real-time night sky guides, interactive planetarium tools, satellite tracking, and event calendars for celestial phenomena like eclipses, conjunctions, and meteor showers. Visitors can explore 3D solar system maps, rising and setting times for planets, deep sky object catalogs, and even printable planispheres and astrolabes, all tailored to their geographic location.
http://f5ad.free.fr/
Built by French radio amateur André Ducros (callsign F5AD), this extensive site covers amateur radio antennas, amateur television (ATV), and ham radio licensing with over 616 pages and 2648 images. It includes 1205 practical antenna descriptions ranging from shortwave to microwave, technical documentation, and resources for ATV transmission, making it a remarkable reference archive for French-speaking radio amateurs.
https://solorb.com/elect
FC's Electronic Circuits is a sprawling hobbyist archive packed with schematics and project descriptions covering everything from solar charge controllers and LED circuits to tube amplifiers, Geiger counters, and amateur radio gear. With dozens of original circuit designs, Arduino projects, and links to related ham radio and electronics builders, this site is a goldmine for DIY electronics enthusiasts.
https://complex-analysis.com/
Created by Juan Carlos Ponce Campuzano, this interactive online textbook introduces complex analysis through visual applets built with GeoGebra, p5.js, and other JavaScript tools, making abstract mathematical concepts tangible and explorable. Covering topics from the Cauchy-Goursat Theorem to conformal mappings, it serves engineering and mathematics students with a beautifully designed, continually updated resource that includes Spanish and Italian translations.
http://skytour.homestead.com/
Wes's astronomy hub, active since 1995, offers a rich collection of observing logs, sketch galleries, comet documentation, meteor shower reports, and essays drawn from decades of visual astronomy with a 10-inch Dobsonian telescope. Highlights include extensive Oregon Star Party trip reports spanning nearly two decades, comet scrapbooks for Hale-Bopp and Hyakutake, and thoughtful amateur astronomy essays that range from beginner telescope guides to celestial measurement explanations.
https://w7aia.org/
The Clark County Amateur Radio Club (W7AIA) serves ham radio enthusiasts in Vancouver, Washington, offering resources on license testing, repeater information, emergency preparedness, and club activities. As an ARRL Special Service Club, they co-sponsor the annual SEA-PAC Ham Convention and provide training, nets, and events like Field Day and Parks On The Air.
https://hexkit.com/
Ron Mott (W4RDM) runs HexKit.com, a small operation fabricating baseplate kits, hubs, and components for homebrew Hex Wire Beam, Moxon, and Spiderbeam amateur radio antennas. Over 1,700 homebrew hex beam builds have used HexKit baseplates worldwide, making this a well-regarded niche resource for DIY antenna builders.
https://farside.ph.utexas.edu/
Richard Fitzpatrick is a Professor of Physics at the University of Texas at Austin, specializing in fusion studies, with this page serving as a hub for his research, teaching materials, academic papers, talks, and books. Visitors interested in plasma physics or fusion energy will find a gateway to substantial scholarly resources from an active academic researcher.
http://n4nw.org/
Amateur radio operator N4NW runs a personal weather station in North Stafford, Virginia, reporting live conditions using a Davis Instruments Vantage Pro2 setup. The site offers current temperature, humidity, wind, rainfall totals, 5-day forecasts, radar links, and a local weather exchange network with neighboring stations.