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)
http://astroa.physics.metu.edu.tr/bigeyes.html
A comprehensive reference table listing the world's largest optical telescopes, compiled by Bill Arnett and hosted at Middle East Technical University's physics department. Each entry includes the telescope's aperture, name, geographic coordinates, altitude, and technical notes, making it a handy quick-reference for astronomy enthusiasts and researchers.
http://panther-observatory.com/
Johannes Schedler's Panther Observatory showcases stunning astrophotography covering the moon, sun, planets, comets, deep sky objects, and constellations, including imaging results from a semi-professional remote observatory at CTIO in Chile. The site also invites visitors to stay at a guest house in Altaussee, Austria, offering dark skies and alpine observing facilities.
https://enolagaia.com/at.html
Dr. Randall Whitaker's Observer Web is a comprehensive academic resource dedicated to autopoiesis and enaction, covering the cognitive biology theories of Humberto Maturana and Francisco Varela. It offers a tutorial, study plan, bibliography, encyclopaedia, and internet guide for anyone exploring second-order cybernetics, radical constructivism, and enactive cognitive science.
https://deepskyorg.tripod.com/deepsky_quiz.html
Deep-Sky.Org hosts an interactive quiz testing visitors' knowledge of deep-sky objects such as nebulae, galaxies, and star clusters. The multiple-choice format makes it a handy study tool for amateur astronomers looking to sharpen their observational knowledge.
https://astronomyinyourhands.com/
Created by Chris Hilder, Astronomy In Your Hands offers free hands-on astronomy activities for classrooms and home learners, including a well-known downloadable Star Wheel planisphere for identifying stars with minimal equipment. The site earned the prestigious Griffith Observatory Star Award and provides low-tech, DIY-friendly resources suited for kids, students, and teachers alike.
https://wm7d.net/hamradio
WM7D dot Net is Mark A. Downing's extensive amateur radio link directory, organized into dozens of categories covering antennas, DX clusters, propagation, QRP, Morse code, satellite info, and much more. With five pages of curated links spanning everything from ARRL headquarters to shortwave and six-meter sites, it serves as a comprehensive reference hub for ham radio enthusiasts.
https://w8dc.org/
The Grand Rapids Amateur Radio Association (GRARA), callsign W8DC, is a Michigan-based amateur radio club offering meetings, license testing sessions, repeater access, and annual events like Field Day and a Hamfest. The site keeps members informed with meeting announcements, minutes, newsletters, and membership information for the greater Grand Rapids area.
https://asgh.org/legacy/links.htm
The Astronomical Society of Greenwich Hills (ASGH) maintains this curated links page connecting amateur astronomers to periodicals, regional astronomy clubs, observatories, equipment suppliers, and NASA educational resources. A thorough reference hub for stargazers in Connecticut and New England, it lists dozens of affiliated clubs and organizations alongside tools for both hobbyists and kids.
https://nerepeaters.com/
The New England Repeater Directory (NERD) is a volunteer-maintained database of amateur radio repeaters across the New England region, updated nightly to ensure accuracy. Visitors can search listings by location and band, plot results on Google Maps, and download the full database as a CSV file for use with radio programming software.
https://assa.org.au/
The Astronomical Society of South Australia (ASSA) is an active community organization offering public and member viewing nights, monthly meetings, and astronomy resources for all skill levels. The site features a rich collection of guides covering astrophotography, comets, variable stars, Aboriginal astronomy, and solar system events, plus details on observing sites like Stockport Observatory.