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://abmedia.com/astro
Chris Cook's extensive astrophotography portfolio spans nearly four decades of celestial imaging, featuring deep sky objects, comets, eclipses, auroras, and stunning nightscape photography captured on both film and digital equipment. With NASA APOD features, astrophotography workshops, and a vast archive organized by technique and subject, this is a remarkable showcase of dedication to the craft.
https://w5yi.org/
W5YI Licensing Services Inc. is a nationwide Volunteer Examiner Coordinator (VEC) offering full-service amateur radio licensing support, including exam sessions, vanity call sign applications, license renewals, and club station licenses. The site also features a youth licensing program that covers FCC fees for applicants aged 25 and under, making it a practical hub for anyone pursuing or maintaining a ham radio license.
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://williamson-labs.com/
Williamson Labs is a comprehensive electronics tutorial site covering foundational topics like transistors, op-amps, 555 timers, and circuit design for learners at various levels. It serves as a structured educational reference for anyone looking to understand basic and intermediate electronics concepts through instructional content.
https://knotplot.com/
Created by Robert G. Scharein, the KnotPlot Site is a visually stunning exploration of mathematical knot theory, featuring hundreds of images and animations generated by the KnotPlot software for Windows, macOS, and Linux. Visitors can browse galleries of torus knots, Celtic knots, hyperbolic knots, Brunnian links, and fractal structures, as well as download the KnotPlot program itself to visualize and manipulate knots in three and four dimensions.
https://skydiary.com/
Chris Kridler's Sky Diary is a long-running storm chasing site dating back to 1997, packed with chase journals, tornado and lightning photography, weather data, and kids' weather facts. A portal for Kridler's broader web presence, it connects visitors to storm chasing accounts, photography portfolios, videos, and live chase tracking.
https://pskreporter.info/pskmap.html
PSKReporter is a real-time propagation mapping tool that aggregates reception reports from amateur radio operators worldwide, showing who is hearing whom across bands and digital modes like FT8, JT65, and PSK31. Created by Philip Gladstone, the interactive map lets operators filter signals by callsign, country, grid square, mode, and time window, making it an invaluable tool for monitoring radio propagation conditions.
http://fishpool.org.uk/
G4WIF shares a growing archive of home construction projects for amateur radio enthusiasts, covering topics like antennas, attenuators, and QRP test equipment. The site also references a co-authored book on simple test equipment for QRPers, with years of archived articles dating back to 2016.
http://hamuniverse.com/antennas.html
Hamuniverse.com, run by N4UJW, is a comprehensive ham radio resource site with a dedicated Antenna Design Lab offering hundreds of antenna projects, designs, and build guides for amateur radio operators. Visitors can browse antenna types by band, explore digital modes, study for license exams, and tap into a wide range of technical articles covering everything from repeaters to emergency power.
https://skywatch.brainiac.com/astroland
Uncle Rod Mollise's Astro Land is a long-running amateur astronomy hub hosted at 'Chaos Manor South,' packed with telescope guides, equipment reviews, CCD and webcam imaging tips, and resources for Schmidt-Cassegrain telescope users. Rod also runs the Mobile Astronomical Society and offers a free Used CAT Buyer's Guide, making this a genuinely useful stop for backyard astronomers of all levels.