Science & Nature
1413 sites
Subcategories:
- Astronomy & Space (390)
- Chemistry (7)
- Earth Sciences (24)
- Biology (76)
- Physics (29)
- Mathematics (51)
- Weather & Climate (100)
- Amateur Radio (681)
- Electronics (45)
http://blog.marxy.org/
Peter Marks (VK2ZZC) runs this long-running blog blending amateur radio experimentation, particularly FreeDV digital voice modes, with regular technology commentary for ABC Radio's Nightlife program. Visitors will find net reports, homebrew radio projects, and tech takes on AI, Apple, and social media policy alongside links to the amateur radio community.
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://members.wolfram.com/jeffb/poster/poster.html
A detailed educational presentation on cataclysmic variable stars (CVs), covering binary star systems, accretion disks, novae, polars, and outburst phenomena with artist renditions and real observational data. Created by Jeff B. and hosted on Wolfram Research servers, the site features light curves, spectra, and telescope images from Lowell Observatory's 31-inch NURO telescope.
https://www.qsl.net/by2hit
The official web presence of the BY2HIT Amateur Radio Club at Harbin Institute of Technology in Harbin, China, reachable via the QSL.net callsign network. The site provides QSL card mailing information and serves as a landing page for this university-based ham radio club.
https://ei7gl.blogspot.com/
John, EI7GL, runs this detailed amateur radio diary chronicling propagation experiments, solar cycle activity, and DX contacts across a wide range of frequency bands from Medium Wave to Microwaves. With thousands of labeled posts covering callsigns from around the world, solar flux data, and band opening reports, it is an invaluable log for radio enthusiasts following HF and VHF propagation conditions.
https://eskimo.com/~oolon/paladin/index.html
The Paladin Contest Club is a casual amateur radio group centered around sharing a special club callsign for contests and mini-DXpeditions, with no formal score competition against other clubs. The site offers access to club bylaws, a member roster, contest scores, and logs, all coordinated by Jack Fleming (WA0RJY).
https://repeater-builder.com/
Repeater Builder is a dedicated resource for amateur radio enthusiasts focused on building, modifying, and maintaining repeater systems. The site dives into the technical side of ham radio infrastructure, making it a go-to reference for hobbyists who want to construct or upgrade their own repeaters.
http://xjubier.free.fr/en/site_pages/solar_eclipses/TSE_1970_GoogleMapFull.html
Xavier Jubier's interactive Google Map traces the path of the March 7, 1970 total solar eclipse across the USA and Mexico, offering a precise geographic visualization of the event's totality corridor. Part of a larger solar eclipse resource site, this page combines historical astronomical data with modern mapping tools to help enthusiasts and researchers explore eclipse paths.
https://m0pqa.com/
Pablo (M0PQA) runs this technical amateur radio blog covering hands-on projects like firmware recovery, AllStar node modifications, APRS gateways, and packet radio on Raspberry Pi. The posts are detailed and practical, making it a valuable reference for hams tackling real-world station challenges.
http://selarc.org/
SELARC is the Southeast Louisiana Amateur Radio Club, serving the Hammond and Tangipahoa area with repeater listings, hamfest event info, ARES emergency communications resources, and monthly newsletters. The site covers everything from FCC licensing and packet radio to amateur radio satellites, making it a solid hub for local hams in the region.