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://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://radioamator.ro/
Radioamator.ro is a comprehensive Romanian-language portal for amateur radio operators, covering everything from equipment construction and digital communications to DX activities, contest calendars, and propagation bulletins. The site serves the Romanian ham radio community with articles, a callbook, forums, and links to the Romanian Amateur Radio Federation.
http://sss-mag.com/smith.html
A comprehensive reference hub dedicated to the Smith Chart, the classic RF engineering tool invented by Phillip Smith of RCA, covering tutorials, software downloads, example charts, reference books, and curated links to related tools and pages. Visitors can explore the mathematical foundations of impedance matching, s-parameters, and microwave design through a well-organized collection of articles, Java applets, and PDF resources.
https://voyager.neocities.org/
Laika's Lonely Planet is a space-themed personal site that invites visitors to drift into the cosmos, named after the famous Soviet space dog Laika. The landing page sets an atmospheric, starry tone with its retro web aesthetic, promising a fuller experience on desktop with JavaScript enabled.
http://www.zerobeat.net/
ZeroBeat.net is a hub for radio communications enthusiasts, featuring technical articles, historical items, and resources covering amateur radio topics like CW telegraphy, QRP low-power operation, and R.L. Drake equipment. Visitors will find links to antenna handbooks, online licensing exams, Morse code resources, and submarine radio operations, making it a handy reference for hams of all experience levels.
http://asnh.org/
The Astronomical Society of New Haven (ASNH) has been connecting Connecticut stargazers for over 80 years, offering public star parties, observing events, astrophotography resources, and a radio show called Cosmic Perspective. Visitors can browse an event calendar, access sky charts, meteorite information, NASA content, and even a book by ASNH member Ruben Kier titled 'The 100 Best Targets for Astrophotography.'
http://smallwonderqrp.blogspot.com/
K.P.S. Kang's blog dedicated to QRP (low-power) radio building, featuring homebrew transceiver projects, circuit schematics, and PCB layouts for minimalist radio construction. Posts cover topics like speech processors, SSB transceivers, and the FIREO low-power transceiver design, making it a useful resource for amateur radio homebrewers.
http://astrophysical.org/
Astrophysical.org is a scientific popularization site run by Istituto Scientia, covering astrophysics and astronomy with sections on stars, magnitude, an online planetarium, and the SAO star catalog. Visitors can explore topics from stellar spectral classification to cosmology, with links to companion site Astrometry.org for celestial mechanics content.
http://ve7sl.blogspot.com/
VE7SL is Steve's amateur radio blog chronicling his homebrewing projects and on-air adventures across an extraordinary range of frequencies, from 2200 meters all the way up to nanowaves. Posts dive deep into technical details like antenna construction, low-band operating on 630m, and solar propagation data, making it a rich resource for experimentally-minded hams.
http://lunar-occultations.com/iota/iotandx.htm
The International Occultation Timing Association (IOTA) is a scientific organization dedicated to observing, timing, and reporting occultations and eclipses, including lunar grazes and asteroid occultations. The site serves as a comprehensive hub with prediction tables, observing guides, software tools like LiMovie and KIWI-OSD, and regional sections spanning Europe, the Middle East, India, Australasia, and East Asia.