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://ancient-skies.org/
Ancient-Skies is a collaborative scientific knowledgebase dedicated to documenting how human cultures across history have understood and represented the night sky. The project, launched around the International Year of Astronomy 2009, aims to gather and verify information from primary sources, making cultural astronomy accessible to both the general public and researchers worldwide.
https://arca-az.org/
The Arizona Repeater Council of Arizona (ARCA) appears to be an organization coordinating amateur radio repeater operations across the state of Arizona. The site uses frames-based navigation, suggesting an older web presence dedicated to ham radio coordination and regional repeater management.
https://azfreqcoord.org/
The Arizona Frequency Coordination Committee is the official body responsible for coordinating VHF and UHF repeater, digital, and point-to-point frequencies for amateur radio operators throughout Arizona. Run by volunteers under the Amateur Radio Council of Arizona, the site provides band plans, repeater listings, coordination policies, and application resources for ham radio operators in the region.
https://gutenberg.org/cache/epub/11587/pg11587-images.html
A digitized 1922 educational text by Charles Lathrop Pack, President of the American Tree Association, covering all aspects of forestry from how trees grow to national forest policy and the dangers of fire and disease. Hosted on Project Gutenberg, this freely available ebook spans 18 chapters and includes period photographs of forests, rangers, and fire damage, making it a fascinating historical resource on early American conservation thought.
https://warc1.org/
The Wichita Amateur Radio Club (WARC) has been serving Kansas ham radio enthusiasts since 1932, making it one of the longer-running amateur radio clubs in the region. The site features news about Field Day operations, repeater information, licensing resources, and club activities including visits from Wichita's mayor during Amateur Radio Week.
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.
http://ccas.us/
The Chester County Astronomical Society (CCAS) is a Pennsylvania-based non-profit bringing together amateur astronomers through monthly meetings, observing sessions, and public star parties for schools and civic groups. The site features an events calendar, member photography, planetarium show schedules at West Chester University, and resources for anyone interested in exploring the night sky.
http://jouscout.com/astro/belmont/belmontd.htm
A detailed double star catalog organized by constellation, compiled by the Belmont Society, listing star pairs with their right ascension, declination, separation, and color descriptions. The catalog is notable for its emphasis on the visible colors of stars, with evocative notes on hues like yellow, blue, orange, and even elusive green, making it a useful observing reference for amateur astronomers.
http://lmars.org/
The Lake Monroe Amateur Radio Society (LMARS) is a ham radio club serving Seminole County and Central Florida, offering members resources like repeater information, a traffic net guide, licensing support, and a newsletter archive dating back to 2009. The site connects hams through regular meetings, fox hunts, Field Day operations, and community communications events, making it a solid hub for local amateur radio enthusiasts.
https://www.qsl.net/dx1cw
The official web home of CW Philippines (Communications World of Amateurs Philippines Inc.), a ham radio club based in Manila that documents DXpeditions to Philippine islands including Batan, Marinduque, and Lubang. The site features expedition photo galleries, contest results, QSL information, membership resources, and articles about amateur radio culture and leadership in the Philippines.