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://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://skymarvels.com/
SkyMarvels is an astronomy education site that guides visitors through the night sky and solar system using interactive animations, videos, and the free 3-D simulation software Celestia. Covering everything from individual planets and moons to deep-sky objects and the scale of the cosmos, the site offers a genuinely immersive experience suitable for beginners and enthusiasts alike.
http://ben.davies.net/telescope.htm
Ben Davies documents the design and construction of a 12.5-inch Newtonian telescope, covering everything from the equatorial horseshoe mount and mirror flotation cell to motorized collimation and CCD imaging. The site also includes observational work on variable stars, nebulae, galaxies, and spectroscopy, making it a rich resource for serious amateur telescope makers.
https://hamradio.lv/
Created by Andris Bruņenieks (callsign YL2FD), this Latvian-language site offers a rich exploration of ham radio history, including the history of wireless telegraphy, radio in Latvia, the Titanic disaster, and Marconi's legacy. Visitors will also find technical resources covering antenna theory, propagation formulas, CW keys, and vintage rigs like Drake and Heathkit.
https://qrz.com/cgi-bin/webcall
QRZ.com is the premier ham radio callsign lookup database, allowing operators to search for licensed amateur radio users by callsign, name, address, grid square, or county. Beyond the core database, the site offers logbooks, DX spotting, forums, exam practice, license renewals, and a bustling swap meet for ham radio gear.
https://kasonline.org/
The Kalamazoo Astronomical Society (KAS) is the oldest astronomy club in Michigan, welcoming members of all skill levels from casual stargazers to experienced observers. The site offers monthly downloadable all-sky star maps, membership information, and meeting schedules for those looking to explore the night sky with a community.
https://projectrho.com/starmap.html
Winchell Chung (aka Nyrath the nearly wise) maintains this ambitious 3-D starmap project dedicated to the golden age of science fiction and real astronomical data. Inspired by E.E. 'Doc' Smith's classic space operas, the site blends scientific accuracy with a deep love of the stars to create interactive three-dimensional maps of nearby stellar neighborhoods.
https://qsl.net/aa3rl/ant2.html
Mike Banz (AA3RL) breaks down the technical question of dipole antenna height with detailed radiation pattern analysis, helping amateur radio operators choose the right height for DX work, local nets, or directional operation. The page features multiple elevation pattern plots comparing dipole performance at various heights, making it a practical reference for hams planning their antenna installations.
http://tcrc.org/
The Twin Cities Repeater Club (TCRC) is a Minnesota-based amateur radio club centered around the 147.210 MHz repeater, which also serves as the primary frequency for South Metro Skywarn weather spotting. Visitors can find repeater information, club calendars, hamfest listings, VE exam resources, and weekly net schedules for Twin Cities-area ham radio enthusiasts.