网站简介：Displays information about the study programs, activities, research, press releases, and the library.
网站简介：A beginner's guide to astronomy with emphasis on the solar system.
网站简介：Contains various images of a selection of galaxies.
网站简介：RWC Brussels World Data Center for the Sunspot Index. Features archives, forecasts and information.
网站简介：Solar educational resources from the Yohkoh X-ray telescope space mission. Includes images, movies, educational resources, and a "tour" of the Sun.
网站简介：An effort to bring open source through the doors of modern day astronomy into the hands of the average person.
网站简介：VIDEOLOGY IMAGING SOLUTIONS is an ISO 9001 registered video camera manufacturer serving industrial, machine vision, biometric, security, IP and specialty OEM markets worldwide.
网站简介：Planetary images as seen from satellites and ground based observatories. Fact sheets on each planet.
网站简介：Bulletin board, meetings, lectures, star parties, calendar, newsletter, and photography.
网站简介：Astronomy is best practiced with powerful telescopes under dark clear skies, but many of us are trapped under city lights where big optics are wasted. Urban Astronomer offers space news updates, educational astronomy articles, and answers reader's questions, all from the perspective of the backyard urban astronomer.
网站简介：Facts, descriptions and pictures, with sections about the Sun, the planets and meteors and asteroids.
网站简介：Bulletin board, articles, clubs, observing information, and resources.
网站简介：PlaneWave designs and manufactures astrograph telescopes for portable use as well as permanent installations.
网站简介：Includes general information, links, a register of dials in North America, and a message board.
网站简介：Freeware allowing one to draw charts according to the data of 15 catalogs of stars and nebulae, as well as the position of planets, asteroids, and comets. Available in English and is translated in 8 other languages.
网站简介：On-line sales of telescopes, microscopes, night vision equipment, spotting scopes and other optics, produced by LOMO as well as many other manufacturers. Located in Illinois.
网站简介：Spotting scopes, binoculars, rifle and handgun scopes, rangefinders and night vision equipment. Product lines include Steiner, Leica, Swarovski, Leupold, Burris, Zeiss, Kahles, Minox and others. Ordering process via mail. Located in California (United States).
网站简介：Applets related to calendars and keeping time, including sidererial time.
网站简介：Offers custom optics fabrication, design consulting and optical testing services for the scientific, industrial and astronomical communities.
网站简介：The society welcomes people of all ages who are interested in the science of astronomy. Accomplished observers and astrophotographers, along with those who are new to the hobby, are welcome. The LCAS tries to respond to all levels of interest.
网站简介：FireWire telescope cameras for astronomers and astrophotography. Buy direct from the manufacturer.er.
网站简介：Gallery, equipment, Jupiter album, moon video, optics calculations, space news, message forum, remote photos, quizzes, and links.
网站简介：Cloudy is an extensive, well-established, large-scale spectral synthesis code designed to simulate fully physical conditions within an astronomical plasma and then predict the emitted spectrum. The web page contains links to papers published with cloudy, the most recent version of the software itself, and a discussion board.
网站简介：Contains information of the types, dynamics, observations, and formation of galaxies.
网站简介：Telescopes by Coulter Optical and other manufacturers, Odyssey binoculars, and accessories. Also sells components and kits including parabolic mirrors, elliptical flats, spiders, and focusers are also available. Located in Florida.