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://qsl.net/ik1hgi/atv.htm
A personal amateur radio page from Italian ham operator IK1HGI, covering ATV (amateur television) and low-frequency 472kHz QRP operation. The site touches on antennas, dipoles, and radio towers, offering a glimpse into the operator's station and technical interests.
http://rivastro.org/index.php
The Riverside Astronomical Society (RAS) has been serving Southern California astronomy enthusiasts since 1957, offering star parties, public outreach, monthly meetings with professional astronomers, and access to their dark sky site GMARS in Landers, CA. The site features event calendars, member resources, sky cameras, weather data, and information about their annual Nightfall star party event.
https://roanestate.edu/pages/obs/index.htm
The Tamke-Allan Observatory at Roane State Community College in East Tennessee hosts public stargazes, telescope-making workshops, and astrophotography events for students and amateur astronomers alike. Visitors can explore images of nebulae and planets captured through the observatory's equipment, find astronomy calendars for the Knoxville area, and connect with the local ORION observing group.
https://qsl.net/nogaqrp
The NOGA QRP Club is an amateur radio club focused on low-power (QRP) radio operation, Morse code (CW), and kit building and construction. This page serves as a redirect to the club's new home at nogaqrp.org, with meta keywords hinting at a community centered around QRP kits like the Pixie transceiver.
https://afvl.li/
The Amateurfunk Verein Liechtenstein (AFVL) is the official amateur radio club of Liechtenstein, founded in 1986 and serving operators in the HBØ callsign region. The site covers club activities, DMR and FM repeaters, WinLink access, emergency communications, AREDN mesh networking, and upcoming events like POTA outings and monthly meetups.
http://server1.wikisky.org/?locale=EN
WikiSky.org is an interactive online sky map that lets users explore stars, galaxies, nebulae, and constellations through a browser-based virtual telescope interface. The site supports over 15 languages and includes community features like astro photography, forums, blogs, and user-contributed star annotations.
https://westislandweather.com/
West Island Weather Station has been monitoring coastal conditions near the Cape Cod Canal in Buzzards Bay, Fairhaven, Massachusetts since 1992, offering live bay cams, tide information, and detailed monthly weather logs. The site also chronicles notable regional weather events including Hurricane Bob 1991, the Blizzard of '78, and the Buzzards Bay Oil Spill of 2003, alongside an archive of over 10,000 photos.
https://weather.ral.ucar.edu/upper
RAL Real-Time Weather's Upper-Air page, maintained by NCAR's Research Applications Laboratory, provides real-time rawinsonde plots and upper-atmosphere wind and temperature data across multiple pressure levels from 925mb to 200mb. Researchers and weather enthusiasts can browse SkewT/LogP charts, loop multi-day animations, and access archived upper-air data sponsored by the NSF National Center for Atmospheric Research.
https://h14s.p5r.org/2012/09/0x5f3759df.html
Christian Plesner Hansen's technical blog dives deep into the legendary fast inverse square root hack and its magic constant 0x5f3759df, tracing the algorithm's surprising history from Ardent Computer in the 1980s through SGI, 3dfx, and Quake III Arena. The post rigorously explains the underlying floating-point bit manipulation, generalizes the technique to arbitrary powers, and includes graphs and mathematical derivations that illuminate why this 'evil' hack actually works.
https://www.qsl.net/g4prs
The Poole Radio Society (G4PRS) is a UK-based amateur radio club representing enthusiasts in the Poole area, hosted on the QSL.net network. The site serves as the club's online presence, likely featuring member information, club activities, and resources for local ham radio operators.