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://www.dxzone.com/
DXZone is one of the oldest and largest directories for amateur radio operators on the internet, cataloging thousands of links across categories like antennas, DXing, software, operating modes, and radio equipment. Running since 1996, it also features news, contest information, DX pedition updates, and weekly curated roundups of the best ham radio websites.
http://calendarzone.com/
The Calendar Zone, created by Janice McLean, is a comprehensive categorized directory of calendar-related links covering art, celestial, cultural, religious, historical, and reform topics. With over 7 million visitors since 1999, it serves as a one-stop hub for anyone curious about calendar systems, moon phases, lunar cycles, and the history of timekeeping across cultures.
http://rainforest.gardenwebs.net/
Stern's Splendors of the Rain Forest is a richly illustrated site dedicated to tropical plants, focusing on orchids, bromeliads, tillandsias, cacti, and succulents native to the Americas. Featuring exotic photo galleries, cultural guides, and links to major plant societies worldwide, it serves as an enthusiast's showcase for rain forest horticulture.
http://nhastro.com/
The New Hampshire Astronomical Society is a volunteer-run nonprofit dedicated to public astronomy education through skywatches, club meetings, and outreach to schools and libraries across New Hampshire. Visitors can find upcoming observing events, solar and lunar data, a telescope lending program, and resources for amateur astronomers throughout the region.
http://astrophysical.org/
Astrophysical.org is a scientific popularization site run by Istituto Scientia, covering astrophysics and astronomy with sections on stars, magnitude, an online planetarium, and the SAO star catalog. Visitors can explore topics from stellar spectral classification to cosmology, with links to companion site Astrometry.org for celestial mechanics content.
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.
http://nightskylive.net/sd
NightSkyLive appears to be a live sky or astronomy viewing resource, likely offering real-time or streaming views of the night sky. The domain and subdirectory suggest a science-focused project aimed at stargazers and astronomy enthusiasts.
http://setileague.org/
The SETI League is a nonprofit membership organization dedicated to the privatized electromagnetic search for extraterrestrial intelligence, coordinating amateur radio astronomers worldwide in the hunt for signals from other civilizations. The site offers extensive technical resources covering antennas, receivers, and software, alongside publications, press releases, and the popular "Ask Dr. SETI" column.
https://sidewalkastronomers.us/
The Sidewalk Astronomers are a public service amateur astronomy association founded in the tradition of John Dobson, dedicated to bringing telescopes directly to the public in parks, street corners, and busy public spaces. The site features event schedules, telescope plans, newsletters, international projects, and resources for local chapters around the world.
https://pskreporter.info/
PSK Reporter is a real-time propagation reporting network for amateur radio digital modes, collecting reception data from operators worldwide to show where signals are being heard. Built by Philip Gladstone, it supports modes like FT8 and PSK31, offers map displays and statistics, and even contributes data to ionospheric research and government licensing investigations.