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/la5ki/index.htm
LA5KI Vintage Ham Radio is a Norwegian amateur radio operator's site dedicated to vintage ham radio equipment and history. The page features a classic old-web aesthetic and serves as a gateway to content about antique radio gear and the amateur radio hobby.
https://rarchams.org/wp
The Rochester Amateur Radio Club (RARC) is an ARRL-affiliated nonprofit based in Rochester, Minnesota, dedicated to advancing amateur radio knowledge and providing public service support to the local community. The site features club meeting minutes going back to 2019, ARES emergency communications resources, Skywarn weather dashboards, repeater information, and a regularly published newsletter called the Hamster.
http://deep-sky.co.uk/asterisms.htm
David Ratledge's guide to observing asterisms takes readers through a collection of star patterns visible through binoculars and small telescopes, complete with images and observing tips. Inspired by a 1998 Sky & Telescope article, this page celebrates overlooked celestial dot-to-dot patterns like Kemble's Cascade, the Coathanger, and the ET Cluster with genuine enthusiasm and hands-on detail.
http://astronomynv.org/
The Astronomical Society of Nevada (ASN) has been promoting astronomy education and public outreach since 1934, making it one of the longer-running amateur astronomy clubs in the region. Visitors can find club membership info, meeting schedules at the Fleischmann Planetarium in Reno, observing resources, photo galleries, and details on events like Messier marathon nights.
https://dk7ih.de/2022/05/new-post-a-walkie-talkie-ssb-transceiver-for-14mhz-or-the-higher-rf-bands
DK7IH is the personal engineering site of Peter Rachow, a radio amateur who documents his homebrew SSB transceiver builds including QRP multiband rigs, walkie-talkie style transceivers, and SMD-based designs for the 14MHz band and beyond. The site is a detailed technical resource for ham radio enthusiasts interested in hands-on RF circuit construction and design.
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://eqsl.cc/qslcard
eQSL.cc is the premier online platform for amateur radio operators to exchange electronic QSL cards, the digital equivalent of the traditional confirmation cards sent between hams after a contact. The site supports logging, awards tracking, contest records, and international callsign lookup, making it an essential hub for the global ham radio community.
http://uksmg.org/content/deadband.htm
Written by Palle Preben-Hansen (OZ1RH), this technical article explains how radio amateurs can make long-distance contacts on the 50MHz (Six Meter) band by exploiting meteor scatter propagation even when the band appears dead. It covers meteor trail geometry, shower timing, diurnal and seasonal meteor rate variations, and practical operating techniques, with supporting figures and links to software and IARU procedures.
https://openphdguiding.org/phd2-log-viewer
PHD2 Guiding is the home of PHD2, a free and open-source autoguiding software used by astrophotographers to keep telescopes precisely locked on celestial targets. This page highlights a log file viewer tool developed by Andy Galasso, which helps users visualize guiding performance and diagnose tracking issues from their PHD2 guide logs.
http://aerith.net/index.html
Seiichi Yoshida's comprehensive comet resource site offers extensive catalogs, weekly bright comet updates, light curves, and thousands of photographs tracking comets from around the world. Yoshida is a notable amateur astronomer who even had a minor planet named after him, and his MISAO project leverages global imagery to detect and track remarkable astronomical objects.