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://sidewalkastronomers.us/
The Sidewalk Astronomers are a public service amateur astronomy association founded in the tradition of John Dobson, dedicated to bringing telescopes directly to the public in parks, street corners, and busy public spaces. The site features event schedules, telescope plans, newsletters, international projects, and resources for local chapters around the world.
https://cryothene.neocities.org/
Cryothene is a technically-minded personal blog covering electronics projects, embedded systems, reverse engineering, and 3D printing, with standout documentation of a custom display driver project called Sharpie spanning many installments. The site also mixes in anime opinions, game reviews, and occasional recipes, but the dominant draw is its detailed hardware and microcontroller writeups.
https://www.qsl.net/dk7zb/start1.htm
DK7ZB's technical antenna resource covers Yagi antenna design, the 28-ohm matching technique, and constructions for amateur radio bands including 2m, 6m, and shortwave. A deep dive into high-gain antenna building for ham radio enthusiasts, featuring the DK7ZB-Match and EME (Earth-Moon-Earth) related content.
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.
http://citynight.com/atv
The personal amateur radio station page of WA6ZJG, operated from Alameda, California in the San Francisco Bay Area, with a focus on Amateur Television (ATV) operations. Visitors can find station information, ATV repeater live video captures from W6CX, announcements, and ham-related links.
https://eznec.com/
EZNEC is a widely used antenna modeling and analysis software package created by Roy Lewallen (W7EL), now available for free as EZNEC Pro+ v7.0. The site provides downloads, documentation, FAQs, and detailed information about the software's NEC-based calculation engines for modeling antenna radiation patterns and wire configurations.
https://rainbowspec.observer/
RainbowSpec is an in-depth yet beginner-friendly educational site exploring how rainbows and color work, covering everything from the visible spectrum and refraction to supernumerary rainbows, fogbows, glories, and thin film interference. The site is thoughtfully organized with starred pages marking foundational concepts, and it links to classic atmospheric optics references that inspired its creation.
http://kellysky.net/
Al Kelly's dedicated astrophotography site showcases stunning CCD images of galaxies, nebulae, star clusters, and solar system objects captured with equipment including a Celestron CGE 1400 telescope and Orion Parsec 8300C camera. Beyond the image galleries, the site offers a CCD instruction manual, a G2V color calibration article, and links to fellow astrophotographers, making it a valuable resource for amateur astronomers interested in CCD imaging.
https://plaws.net/
Peter Laws has maintained this personal page since 1994, with amateur radio as its clear centerpiece, including newsletters from the University of Arkansas Amateur Radio Club dating back to 1992 and numerous presentations and videos on topics like satellites, DXLab, and outdoor warning sirens. The site also touches on scanning, trains, and AI, but the depth of ham radio content spanning three decades makes it a genuine archive for radio enthusiasts.
http://n4nw.org/
Amateur radio operator N4NW runs a personal weather station in North Stafford, Virginia, reporting live conditions using a Davis Instruments Vantage Pro2 setup. The site offers current temperature, humidity, wind, rainfall totals, 5-day forecasts, radar links, and a local weather exchange network with neighboring stations.