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/ciarc
The Christians of Idaho Amateur Radio Club (CIARC) is a faith-based ham radio organization that monitors multiple simplex frequencies and aims to spread the Christian faith through amateur radio. Designed by Darin Roberts in 2006, this club site serves as a hub for members who combine their passion for radio communication with their religious mission.
https://grace.umd.edu/~tlaloc/archastro
The official web presence of the Center for Archaeoastronomy, a professional research organization founded at the University of Maryland in 1978, dedicated to the interdisciplinary study of astronomy in ancient and indigenous cultures. Visitors can explore peer-reviewed publications, newsletters, essays on ethnoastronomy, and learn about ISAAC, the international society promoting archaeoastronomy worldwide.
https://assa.org.au/
The Astronomical Society of South Australia (ASSA) is an active community organization offering public and member viewing nights, monthly meetings, and astronomy resources for all skill levels. The site features a rich collection of guides covering astrophotography, comets, variable stars, Aboriginal astronomy, and solar system events, plus details on observing sites like Stockport Observatory.
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.
http://davidmalin.com/fujii/fujii_index.html
A stunning image gallery showcasing the complete Akira Fujii and David Malin Images (DMI) collection of astrophotography, organized into categories including constellations, Milky Way, star trails, solar eclipses, comets, and aurorae. The collection features wide-field photographs of the southern sky taken from Australian observatories, capturing objects like the Southern Cross, Carina Nebula, and Comet McNaught with remarkable detail.
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.
https://hermetic.ch/cal_stud/jdn.htm
Peter Meyer's detailed reference article explains the Julian Day Number system, covering its origins, astronomical vs. chronological uses, and various related date formats like Modified Julian Day Numbers and Lilian Day Numbers. The page includes conversion algorithms and links to calendar software tools, making it a thorough technical reference for astronomers, historians, and calendricists.
https://www.qsl.net/g3ral
A QSL.net hosted page for the callsign G3RAL, pointing to an amateur radio operator's personal directory on the network. The sparse file index suggests a personal ham radio page typical of the QSL.net hosting platform, where licensed operators share station info and radio-related content.
https://kb8vsr.tripod.com/index.html
Shane Worth, callsign KB8VSR, runs this General Class amateur radio personal site featuring sections on SSTV (slow-scan television), a logbook, ham radio links, and an introduction to what ham radio is. A classic old-web ham shack homepage with multiple navigation sections that give a solid overview of one operator's on-air activities.
https://user.xmission.com/~uarc
The Utah Amateur Radio Club (UARC) is a long-established ham radio club based in Kearns, Utah, offering members access to repeaters, HF remotes, a lending library, and an 'Elmer' mentorship list. The site covers club events like Field Day and potluck dinners, exam schedules, net schedules, and resources for both new and experienced amateur radio operators in Utah.