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/n5tle
Kelly Kohls (N5TLE) shares his amateur radio interests alongside a collection of DMX512 electronics projects built around the PIC16F876 microcontroller, including source code, hex files, schematics, and functional descriptions. The site is a practical resource for anyone interested in DMX512 lighting control interfacing with analog voltage converters using PIC microcontrollers.
https://ptri1.tripod.com/
A detailed educational resource dedicated entirely to Pascal's Triangle, covering its construction, history, and the surprising number of patterns hidden within it. Visitors can explore topics ranging from the Fibonacci sequence and Sierpinski fractals to prime numbers and polygonal numbers, with downloadable programs to generate and visualize the triangle's patterns.
https://meteore.forumattivo.com/
The Italian Meteor and TLE Network (IMTN) is a national Italian surveillance network dedicated to observing and studying meteors, fireballs, and Transient Luminous Events (sprites, jets) in the upper atmosphere between 20 and 120 km altitude. Founded in January 2009, the network operates permanent and mobile video and radio stations around the clock, connecting university researchers, amateur astronomers, and scientific associations across Italy.
https://irlp.net/
The official home of the Internet Radio Linking Project (IRLP), a system that connects amateur radio repeaters around the world using Voice over IP technology. The site provides information, maps, node codes, frequencies, and technical details for ham radio operators looking to link into the IRLP network.
https://www.qsl.net/fara
The Framingham Amateur Radio Association (FARA) ran this club hub for ham radio operators in the Framingham, Massachusetts area, featuring meeting schedules, flea market announcements, licensing events, and DX-pedition photos. A great snapshot of an active local amateur radio club from the early 2000s, complete with member callsigns, ARRL news feeds, and resources for newcomers seeking their first no-code license.
https://ancient-skies.org/
Ancient-Skies is a collaborative scientific knowledgebase dedicated to documenting how human cultures across history have understood and represented the night sky. The project, launched around the International Year of Astronomy 2009, aims to gather and verify information from primary sources, making cultural astronomy accessible to both the general public and researchers worldwide.
https://cadxa.org/
The Central Arizona DX Association (CADXA) is a ham radio club founded in 1974 and based in Arizona, boasting over 100 members many of whom hold ARRL DXCC Honor Roll status. The site offers resources for DXers including QSL card checking, a DX calendar, contest calendars, club rosters, and information on joining one of the largest amateur radio DX clubs in the state.
https://radiomasterlist.com/en/index.html
RadioMasterList.com is a comprehensive reference directory cataloging specifications, performance data, and prices for hundreds of amateur radio transceivers, professional receivers, SDRs, and vintage radios from brands like Yaesu, ICOM, Kenwood, and more. Whether you're comparing HF transceivers or hunting down specs on a classic 1970s shortwave receiver, this site serves as a go-to database for radio enthusiasts and serious operators alike.
http://djburnette.com/chasing
Dr. Dorian J. Burnette, a meteorology professor, documents his storm chasing expeditions dating back to 1997 with a detailed archive of chase logs organized by year. The site emphasizes scientific purpose, safety, and education, reflecting his practice of bringing students into the field to witness real atmospheric events firsthand.
https://metrocor.net/
MetroCor is the Metropolitan Coordination organization for amateur radio repeaters covering New York City, New Jersey, and surrounding counties, maintaining an extensive database of coordinated frequencies across bands from 10 meters through 23 centimeters. The site publishes detailed repeater coordination tables listing hundreds of callsigns, output and input frequencies, PL tones, and coordination status for the greater NYC metro area.