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://antenna.it/
Giovannini Elettromeccanica is an Italian antenna manufacturing company specializing in HF antenna systems for both military and commercial applications, covering the RF spectrum from 1.5 to 30 MHz. Their product catalog includes log-periodic antennas, broadband wire dipoles, fiberglass masts, antenna rotators, and towers, with research, design, manufacturing, and support services all offered in-house.
http://newastro.com/
Ron Wodaski's companion site to his book 'The New Astronomy' offers a comprehensive online guide to CCD astrophotography, covering everything from focusing and exposure to advanced image processing. With ten full chapters available online by subscription, plus sample content and a community discussion group, it serves as a practical resource for beginner and intermediate amateur astronomers.
https://nineplanets.org/amateur-astronomical-observatories
The Nine Planets hosts a curated list of amateur astronomical observatories built by individual hobbyists, compiled by the site owner during research for their own backyard observatory project. Visitors will find practical inspiration and design ideas ranging from simple roll-off roof builds to more complex dome structures, all set within a broader astronomy reference site covering planets, stars, comets, and equipment guides.
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.
http://blog.marxy.org/
Peter Marks (VK2ZZC) runs this long-running blog blending amateur radio experimentation, particularly FreeDV digital voice modes, with regular technology commentary for ABC Radio's Nightlife program. Visitors will find net reports, homebrew radio projects, and tech takes on AI, Apple, and social media policy alongside links to the amateur radio community.
https://www.qsl.net/harc-az
The Hassayampa Amateur Radio Club (HARC) of Arizona maintains this QSL.net-hosted hub for local ham radio operators in the region. Visitors can find club information, meeting details, and resources connecting amateur radio enthusiasts in the Arizona area.
http://stratigrafia.org/cincy
Created by Steven Holland of the UGA Stratigraphy Lab, this site documents the extraordinary fossil record and rock strata of the Upper Ordovician near Cincinnati, Ohio, covering over 470 genera and 1200 species. It combines detailed paleontology with cutting-edge stratigraphic interpretation, making it a valuable reference for both professional researchers and amateur fossil enthusiasts.
https://onlinestatbook.com/rvls.html
The Rice Virtual Lab in Statistics (RVLS), created by David Lane at Rice University, offers a comprehensive suite of free web-based tools for learning and teaching statistics, including an interactive online textbook, Java simulations, real-world case studies, and an analysis lab. Supported by the National Science Foundation and recognized by multiple educational organizations, it covers topics from basic descriptive statistics to ANOVA and regression.
https://nic.funet.fi/pub/astro/html/astro-uk.html
Hosted on the Finnish University and Research Network (FUNET), this is the national homepage for amateur astronomy in Finland, maintained by members of the Ursa Astronomical Association. It organizes links to Finnish astronomical clubs, research institutions, schools, planetaria, publications, and observation resources, reflecting a country with one of the highest per-capita rates of amateur astronomers in the world.
https://dcara.net/
The Denton County Amateur Radio Association (DCARA) is the official club site for ham radio operators in Denton County, Texas, operating under club call sign W5NGU. Visitors can find information about club meetings, repeater status, license classes, public service events, Field Day activities, and membership details for the North Texas amateur radio community.