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://rrac.org/
The Red River Astronomy Club (RRAC) serves amateur astronomers in the Ark-La-Tex region, offering observing sessions at their property near Nashville, AR, star party information, and astro photo galleries. The site includes links to local sky conditions, club news, member resources, and connections to astronomy clubs across Arkansas and Texas.
http://pictures.ed-morana.com/
Ed Morana's personal astronomy photo and video archive documents rare celestial events including total solar eclipses, Venus and Mercury transits, ISS transits, asteroid occultations, and the Northern Lights. The collection spans events from 2006 through 2024, with time-lapse composites and an Android app for ISS transit prediction making it a genuinely useful resource for amateur astronomers.
https://www.qsl.net/wa6bgs
The Amateur Radio Club of El Cajon (WA6BGS) is an ARRL Special Service Club serving San Diego County, with information on monthly meetings, membership applications, and T-Hunting activities. The site includes a preserved 2005 version for historical reference alongside solar and geomagnetic field status indicators popular among ham radio operators.
https://www.was.org.nz/useful-links
The Wellington Astronomical Society maintains this curated links page connecting visitors to astronomy resources across New Zealand and beyond, from national societies to educational tools for children. Organized into regional and international sections, it serves as a handy gateway to observatories, sky guides, STEM activities, and fellow astronomy clubs throughout New Zealand.
http://wa1mba.org/
Tom WA1MBA has built a comprehensive resource dedicated to microwave amateur radio, covering everything from 10GHz rainscatter propagation to millimeter wave band projects, waveguide design, and LNA and quadrupler hardware builds. Active since 1996, the site features technical papers, conference presentations, RF connector guides, and a mailing list reflector for fellow microwave ham enthusiasts.
https://jrm.phys.ksu.edu/Scouts/Space-AstroLinks.html
Compiled by Vincent Needham at Kansas State University, this extensive link directory covers virtually every corner of space and astronomy on the web, from advocacy groups and industry players to SETI projects and digital sky surveys. With over 270 curated links organized into categories like amateur rocketry, space missions past and future, telescopes, and planetary science, it serves as a thorough reference hub for space enthusiasts and researchers alike.
https://cometchasing.skyhound.com/
Comet Chasing, maintained by Skyhound, provides monthly up-to-date observing guides for telescopic comets visible this month, complete with finder charts, observing synopses, and brightness predictions tailored to your latitude and equipment. It covers current comets like Kreutz sungrazers and PANSTARRS discoveries, making it an invaluable tool for amateur astronomers who want to hunt comets visually or through imaging.
https://shallowsky.com/moon/moonlinks.html
A comprehensive curated link collection for amateur lunar observers, gathering moon maps, photographic atlases, observing guides, and software tools from across the early web. Part of the broader Hitchhiker's Guide to the Moon project at Shallow Sky, it serves as an invaluable jumping-off point for anyone wanting to study the moon's features in depth.
https://ure.es/
The Unión de Radioaficionados Españoles (URE) is Spain's national amateur radio association and the Spanish section of the IARU, serving as the official body representing ham radio operators across the country. The site offers licensing information, exam guidance, contest calendars, QSL traffic resources, a webcluster, a members-only area, and a regularly published magazine called Radioaficionados.
http://jap.hu/electronic/rf.html
Peter's RF schematics page is a technical reference collection of radio frequency circuit diagrams spanning receivers, transmitters, and transceivers across a wide range of frequencies from 27MHz to 1GHz. Hobbyists and engineers will find schematics for superregenerative receivers, FM audio transmitters, walkie-talkies, SAW-based designs, and datasheets for chips from major manufacturers like Silicon Labs, HopeRF, and Texas Instruments.