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://n5hq.com/
N5HQ is the personal ham radio site of an Extra Class operator licensed since 1978, covering SSTV, DSSTV, QSL cards, antenna design tools, and amateur radio licensing resources. The site also highlights the operator's involvement as an ARRL Volunteer Examiner, Skywarn weather spotter, and Ten-Ten International member.
http://foxtango.org/foxtango001.htm
Fox Tango International is a long-running Yaesu users group established in 1972, dedicated to owners and enthusiasts of Yaesu radio equipment. The site hosts technical manuals, modification pages, classified ads, and historical looks at vintage Yaesu transceivers from the 1960s through today.
https://cadcwww.dao.nrc.ca/
The Canadian Astronomy Data Centre (CADC) is an official Government of Canada research facility that archives and provides access to astronomical data for scientists and researchers. Hosted by the National Research Council of Canada, it serves as a centralized repository for observational astronomy data collections.
http://web.mit.edu/redingtn/www/netadv/welcome.html
Created by Norman Hugh Redington at MIT, The Net Advance of Physics is an encyclopedic collection of review articles and tutorials covering the full breadth of physics, organized alphabetically and continuously updated since 1995. Special features include a 19th century physics retro archive, history of science resources, a science poetry collection, and curated links to recent controversies in the field.
https://sarts.org.sg/
The Singapore Amateur Radio Transmitting Society (SARTS) is the national organization for ham radio enthusiasts in Singapore, offering resources on licensing, frequency bands, and getting started with amateur radio. The site features news posts on topics like FreeDV signals, web SDRs, and satellite launches, along with a marketplace, gallery, and membership information for the local ham community.
https://scrrba.org/
The Southern California Repeater and Remote Base Association (SCRRBA) is a volunteer organization that has coordinated amateur radio frequencies across Southern California since 1970, maintaining over 2,400 frequency coordination records. Visitors can find band plans, hotspot radio guidance, open repeater listings, and coordination policies covering frequencies from 29MHz through microwave bands.
https://weathertogether.net/weather-links
WeatherTogether is a community weather resource offering an extensive curated directory of weather observation tools, model data, radar, satellite imagery, and oceanographic resources from major institutions like NOAA, NWS, and various universities. The sheer breadth of categorized links covering surface observations, upper air data, aviation weather, and ocean conditions makes it a valuable one-stop reference for weather enthusiasts and professionals alike.
http://cimss.ssec.wisc.edu/goes/goesdata.html?fbclid=IwAR1tJwdbaRkZL3OS55qttm0KXOx16pK2Mw2uGiGqFSr_WDBDL4FuR8l7eEE
Maintained by Tim Schmit at CIMSS/SSEC (University of Wisconsin-Madison), this comprehensive link directory aggregates GOES satellite imagery sources from NOAA, NASA, and international agencies including Brazil, Mexico, Chile, and Canada. Visitors can access real-time ABI imagery across all bands, mesoscale sectors, full-disk views, and animated GIFs from dozens of platforms covering both GOES-East and GOES-West.
https://pglpm.github.io/Pinference
Pinference is an R package by PierGianLuca Porta Mana that implements probability inference for propositional logic, calculating lower and upper probability bounds for logical expressions using Hailperin's procedure. The documentation site covers the theoretical foundations connecting probability calculus to sequent calculus, with worked examples and an API reference for the inferP() function.
https://themineralgallery.com/
The Mineral Gallery is a comprehensive online reference dedicated to minerals, featuring detailed descriptions, chemical formulas, physical properties, and photographs of hundreds of mineral specimens. It serves as an invaluable resource for collectors, geology students, and enthusiasts seeking in-depth information on everything from common quartz varieties to rare sulfosalts.