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/w9ikn
The Elgin Amateur Radio Society (E.A.R.S.), callsign W9IKN, was a ham radio club based in Elgin, Illinois with roots stretching back to the early 1930s. This archived homepage serves as a farewell tribute, noting the club's disbanding and expired licenses in 2007, with a link to its past history preserved by member Chuck Henrici (N9TZO).
https://micro.magnet.fsu.edu/primer/java/scienceopticsu/powersof10
Hosted by Florida State University's National High Magnetic Field Laboratory, this interactive tutorial takes visitors on a visual journey from 10 million light-years away down to the subatomic level in successive powers of ten. The experience moves through galaxies, the solar system, Earth, a leaf, its cells, DNA, and finally protons and electrons, making the concept of scale tangible and awe-inspiring.
http://aimspice.com/
AimSpice appears to be a SPICE circuit simulation software site, offering tools for electronic circuit analysis and modeling. The minimalist page redirects visitors to the main document, suggesting a focused software or technical resource for electronics engineers and hobbyists.
https://www.qsl.net/fcarc
Hosted on QSL.net, this appears to be the web presence for FCARC, likely a local amateur radio club or organization. The site is indexed on the QSL.net network, a well-known hosting platform dedicated to ham radio groups and operators worldwide.
https://lostartoflogarithms.com/
Charles Petzold's web-book-in-progress explores the history, utility, and mechanics of logarithms, from their origins in 400-year-old mathematical tables to slide rules and spherical trigonometry. With over 30 chapter-length pages covering topics like the Book of Vlacq, log-log scales, and John Napier's life, this is a rich and deeply researched labor of love for math history enthusiasts.
https://apod.nasa.gov/apod/archivepix.html
The legendary NASA Astronomy Picture of the Day archive is a comprehensive chronological index linking to thousands of daily astronomy images spanning from 1995 to the present, each accompanied by expert explanations written by professional astronomers. Featuring entries on nebulae, planets, eclipses, star clusters, and deep-sky objects, this archive is an endlessly explorable treasure trove for anyone fascinated by the cosmos.
http://xjubier.free.fr/en/site_pages/solar_eclipses/ASE_1984_GoogleMapFull.html
Xavier Jubier's interactive Google Map traces the path of the May 30, 1984 annular solar eclipse across the USA, offering a detailed geographic visualization of this historical celestial event. Part of a larger solar eclipse resource site, this page lets visitors explore the eclipse path with precision using interactive mapping technology.
https://radio-astronomy.org/
The Society of Amateur Radio Astronomers (SARA) is a membership organization dedicated to the practice and promotion of radio astronomy among hobbyists, students, and educators. The site offers a wealth of resources including a peer-reviewed journal, educational guides for getting started, student grant programs, project sections, and details about annual conferences held across the United States.
https://wsjt.sourceforge.io/wsjtx.html
WSJT-X is the official home page for a suite of weak-signal communication software developed by Joe Taylor (K1JT) and the WSJT Development Team, supporting digital modes like FT8, FT4, JT65, WSPR, and more. The site provides user guides in multiple languages, release notes, and technical documentation for operators pursuing EME moonbounce, meteor scatter, and other extreme weak-signal amateur radio contacts.
https://qsl.net/hdxa
The Heartland DX Association is a ham radio club based in the heartland region, serving as the sponsor of the Nebraska QSO Party contest. This redirect page points visitors to their new website, offering a glimpse into the club's focus on DX operating and amateur radio contesting.