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://crystalinks.com/precession.html
Crystalinks explores the precession of the equinoxes and the Age of Aquarius, weaving together astronomy, ancient civilizations, and esoteric symbolism into a single reference page. Visitors will find discussions of the North Pole Star Thuban, the Great Sphinx, Draco constellation, Milankovitch cycles, and the significance of sidereal years across ancient cultures.
https://qsl.net/we1fly
The Aeronautical Mobile Operators Club, callsign WE1FLY, is dedicated to ham radio operators who take their hobby airborne, earning the nickname 'Flyin' Hams.' The site provides resources on operating amateur radio in aircraft, including links to FAA regulations, QRZ.com profile info, and eQSL lookup for members.
https://starastronomy.org/
STAR (Society of Telescopy, Astronomy, and Radio) is a Monmouth County, NJ amateur astronomy club founded in 1957, offering monthly meetings, star parties, observing nights, and public outreach programs for all experience levels. The site features sections on telescope making, light pollution, a spectrogram tool, member photos, and a picture of the day, making it a rich hub for local stargazers.
https://qsl.net/swlham
Mike (KC9LDO) runs this amateur radio hub packed with real-time propagation data, DX news feeds, solar and geomagnetic condition monitors, and links to DX logs and QSL resources. It serves as a handy dashboard for ham radio operators interested in VHF, DX chasing, and band conditions across multiple frequencies.
https://sites.utexas.edu/n5xu
The University of Texas Amateur Radio Club (UTARC) has operated under the callsign N5XU since its founding in 1921, making it one of the longest-running college radio clubs in the country. The site covers club meetings, local nets, repeater information, and resources for getting a ham radio license, with membership open to all UT-affiliated students, faculty, and staff at no cost.
http://smallwonderqrp.blogspot.com/2019/04/fiero-compact-qrp-ssbcw-transceiver.html
K.P.S. Kang's blog dedicated to QRP (low power) radio transceiver design, featuring detailed technical write-ups on homebrew SSB/CW transceivers like the FIREO, which uses an innovative FM limiter circuit for speech compression. A must-read for ham radio enthusiasts interested in minimalist radio construction and RF engineering theory.
https://marc-hq.org/
The Motorcycling Amateur Radio Club (MARC) is a community group that combines motorcycle riding with ham radio operation to support charity fundraising events like Bike MS rides in Southern California. The site includes a tech center, photo gallery, newsletters, event calendar, and membership information for riders and operators who want to combine their passions while giving back.
http://www.seasky.org/
Sea and Sky is a dual-themed educational resource covering both ocean life and the universe, with sections on coral reef creatures, deep sea exploration, saltwater aquariums, constellations, and space exploration timelines. Visitors can browse image galleries, play free sea-themed games, read news headlines, and dive into hundreds of curated links covering marine biology and astronomy alike.
http://inconstantmoon.com/
Inconstant Moon offers nightly multimedia tours of the lunar surface, complete with maps, photos, animations, and music to guide both beginners and experienced observers through the Moon's craters, seas, and phenomena. A Scientific American Sci/Tech Web Awards honoree and BBC Space featured site, it includes a Cyclopedia Selenica and Selenographia making it a comprehensive reference for lunar astronomy.
https://home.adelphi.edu/~stemkoski/mathematrix/index.html
Mathematrix, created by Lee Stemkoski at Adelphi University, explores the playful and lesser-known side of mathematics through topics like polyominoes, Rubik's Cube, fractals, Conway's Game of Life, and higher dimensions. Accessible to curious minds at any level, the site blends mathematical art, humor, poetry, and hands-on puzzles to make recreational math genuinely entertaining.