网站简介：Uses Google Maps interface and NASA imagery to show how the Earth is seen at night from space.
网站简介：NASA program that studies Sun-Earth interaction with links to an educational component of the program and includes detailed information on a number of satellites and data.
网站简介：Obtain a table of the times of sunrise/sunset, moonrise/moonset, or the beginning and end of twilight, for one year.
网站简介：A skygazing department in the Division of Physical Sciences.
网站简介：Provides spectrometers, monochromators and spectrographs for research and industrial spectroscopy applications. Also provides VUV-UV optics, coatings and subassemblies.
网站简介：[online] An open-forum electronic magazine for serious amateur astronomers.
网站简介：Discount supplier of sports optics equipment in the UK. Sells scopes, binoculars, telescopic sights, rangefinders, night vision equipment and clothing. Site features an on-line shopping cart.
网站简介：Information for observers, calendar, publications and libraries, seminars and conferences, fellowship program, and links.
网站简介：Provides an online interactive system. Includes articles, gallery, forum, and FAQ.
网站简介：Shows images from an all-sky camera operated by the Sodankylä geophysical observatory in Finland. Part of the ESA Space Weather Applications Pilot Project.
网站简介：Contains digitized images of the whole sky.
网站简介：Features range of telescopes from the brands Meade and Skywatcher. Also sells accessories for astro-photography such as CCD cameras from Atik and Artemis.
网站简介：Composed of over two hundred local amateur astronomical societies from across the United States. Information on national conventions (ALCons), member societies, regions, Astronomy Day, and awards.
网站简介：Offers information on learning about astronomical objects and then viewing the objects through use of the eye or with various optics.
网站简介：City centre observatory with lectures, exhibitions and visitors centre. Includes Astronomy Technology Centre and Edinburgh University's Institute for Astronomy.
网站简介：Photometers, telecompressors, electric Crayford style focusers, filter wheels and filters, and optical couplers for video microscopy.
网站简介：A U.K. manufacturer which manufactures a series of Peltier cooled and air cooled CCD imaging and video cameras for astronomy. The firm also sells cameras and telescopes from third party manufacturers.
网站简介：Binocular specialists. Includes details of the product range and an online product advisor.
网站简介：Hong Kong based educational manufacturer and exporter of small telescopes and microscopes.
网站简介：The site of California and Carnegie program for extrasolar planet search.
网站简介：Some facts, quotations, trivia chosen at random.
网站简介：Space education and entertainment centre with a planetarium, classrooms, and multi-media programs. Includes program information, showtimes, and educational materials.
网站简介：High Altitude Observatory (HAO) is dedicated to the study of the Sun and of the response of the Earth's upper atmosphere to the Sun's output.
网站简介：Desktop planetarium and charting program. [Commercial - Dos, Win3.1/95/NT]
网站简介：Meetings, STARFEST, downloads, and gallery.