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)
http://johncath.force9.co.uk/radio%20projects.htm
John Cath's radio project pages feature detailed amateur radio construction projects including a 17-page guide to building a 600W 50MHz solid state amplifier and a power splitter for 70cm. The site reproduces designs from RadCom magazine and the Radio Society of Great Britain, making it a useful reference for ham radio builders and experimenters.
https://pnwherbaria.org/
The Consortium of Pacific Northwest Herbaria is a collaborative portal uniting 60 regional herbaria across Alaska, British Columbia, Oregon, Washington, Idaho, Montana, and the Yukon, offering access to over 3.6 million plant specimen records and nearly 1.8 million images. Researchers and naturalists can search the database by label data or geographic location, download datasets for offline use, and consult a fully annotated checklist of vascular plants native to the Pacific Northwest.
https://oiseaux.net/index.en.html
Oiseaux.net is a comprehensive ornithological portal covering more than 10,000 bird species worldwide, complete with species sheets, photos, drawings, birdsongs, and thematic files for all skill levels. The site also features identification tools powered by artificial intelligence, birdsong quizzes, games, a forum, and curated news from the ornithological world.
http://xjubier.free.fr/en/site_pages/solar_eclipses/TSE_1973_GoogleMapFull.html
Xavier Jubier's interactive Google Map documents the path and details of the June 30, 1973 total solar eclipse over Mauritania, offering a precise geographic visualization of this historical celestial event. The map-based format makes it easy to explore the eclipse's path of totality across the region with geographic context.
https://ring.fediverse.radio/
Fediverse.Radio WebRing connects 35 amateur radio enthusiast sites whose operators are active on the Fediverse, the decentralized social network. Run by M0YNG, a licensed radio amateur in Gloucestershire, the ring makes it easy to discover blogs, personal pages, and resources from ham radio operators around the world.
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.
https://ncatlab.org/nlab/show/HomePage
The nLab is a collaborative wiki covering advanced mathematics, physics, and philosophy with a strong emphasis on category theory, homotopy theory, topos theory, and their connections to theoretical physics. It serves as an encyclopedic reference for researchers and students working at the intersection of higher mathematics and mathematical physics, offering thousands of deeply interlinked articles.
http://talkorigins.org/faqs/faq-solar.html
Written by Sverker Johansson, this detailed FAQ explores the science of solar neutrinos, nuclear fusion in the sun, helioseismology, and the famous solar neutrino problem with rigorous depth and extensive references. It also addresses creationist arguments about the sun, making it a uniquely thorough resource for both scientific education and skeptical inquiry.
https://hc2ae.tripod.com/
HC2AE is a Spanish-language ham radio hub created by an amateur radio operator in Guayaquil, Ecuador, serving as a meeting point for Latin American radioaficionados. The site features a Guayaquil callbook searchable by callsign or name, DX information, contest listings, propagation resources, software links, and a chat and forum for the ham radio community.
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.