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://astroverde.org/
Astroverde is the official website of the Astronomers of Verde Valley, an amateur astronomy club based in Northern Arizona's Verde Valley region. Visitors can browse member astrophotography galleries, find star party schedules, access observing tools, and learn how to join the club.
http://jgiesen.de/welcomeEnglish.htm
A rich hobbyist resource by J. Giesen featuring an extensive collection of Java and JavaScript applets covering astronomy topics like sun and moon phases, planet positions, sundials, Venus transits, and satellite observation. Visitors will also find physics quizzes, chaos and fractal simulations, color theory tools, and links to books and software, making it a deep interactive playground for science enthusiasts.
https://qsl.net/ke4ish
KE4ISH is the personal ham radio page of a licensed operator in Liberty County, Georgia, with over 20 years of professional communications experience spanning the Army and telephone industry. The site covers his role as Assistant Emergency Coordinator, involvement with Georgia Army MARS, local club and repeater info, and participation in the Amateur Radio Webring.
http://k5dkz.com/
Frank Kamp's K5DKZ ham shack site is a rich technical resource covering homebrew radio equipment, antennas, amplifiers, and repairs for classic rigs like Collins, Drake, and Heathkit gear. Visitors will find detailed pages on building tube amplifiers, Z-match tuners, DX-60 and DX-20 clones, and a wide variety of antenna designs from vertical beams to trap dipoles.
https://w9smc.com/
The Society of Midwest Contesters (SMC) is a club uniting amateur radio operators across the Midwest who compete in radio contesting events, with resources covering membership, awards programs, VHF contesting, and call area records. The site features a championship medals leaderboard, annual SMC Fest gathering details, contest calendars, and a contesting library making it a hub for competitive ham radio operators in the region.
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.
https://w4cue.com/
The Birmingham Amateur Radio Club (W4CUE) is the official web home of a long-running ham radio club based in Birmingham, Alabama, affiliated with the ARRL. Visitors can find meeting schedules, net frequencies, hamfest event coverage, license exam information, and club news including the annual Citizenship Award.
http://rcra.wagnera.com/
The Red Cedar Repeater Association (RCRA) is a Wisconsin-based amateur radio club established in 1974, serving as trustee for the K9KGB repeater system covering West Central Wisconsin along the I-94 corridor. The site provides technical details on their 2-meter repeater frequencies, PL tones, and remote links, along with embedded National Weather Service radar tools useful for local operators.
http://wasan.jp/english
Created by Hiroshi Kotera, this site documents Sangaku, the beautiful geometric theorems that Japanese scholars of all social classes inscribed on wooden tablets and dedicated to shrines and temples during the Edo period. It offers images of surviving Sangaku tablets and serves as a rare English-language window into this uniquely Japanese mathematical tradition dating back to 1996.
https://mtarchive.geol.iastate.edu/
The ISU Meteorology Archive (MTArchive) at Iowa State University provides a massive publicly accessible repository of historical weather data and satellite imagery spanning from 1933 to the present. Maintained by the Iowa Environmental Mesonet project, it includes decades of archived GOES satellite imagery viewable through the IEM CoD Archive Viewer, making it an invaluable tool for researchers and meteorology enthusiasts alike.