Title: ADS Astronomy Provider: NASA Subject Heading/s: Astronomy; Sun--Research--United States LC Class: QB Reference Category: Indexes Description: NASA's Astronomy and Astrophysics/Planetary Sciences/Solar Physics Abstract Service provides this indexing (1975- ) plus full text of more than two dozen journals and several books.

Title: Astronomical Applications Provider: U.S. Naval Observatory Subject Heading/s: Astronomy LC Class: QB Reference Category: Almanacs Description: Positions of the sun and moon, information on asteroids, and seasonal dates are provided by the U.S. Naval Observatory.

Title: [Astronomy] Dictionary Provider: U.S. Naval Observatory Subject Heading/s: Astronomy LC Class: QB Reference Category: Dictionaries Description: An interactive encyclopedic dictionary of astronomy created by the Laboratory for High Energy Astrophysics at the NASA/Goddard Space Flight Center.

Title: Earth and Moon Viewer Provider: Fourmilab Subject Heading/s: Earth; Moon LC Class: QB Reference Category: Atlases Description: "You can view either a map of the Earth showing the day and night regions at this moment, or view the Earth from the Sun, the Moon, the night side of the Earth, above any location on the planet specified by latitude, longitude and altitude, from a satellite in Earth orbit, or above various cities around the globe . . . In addition to the Earth, you can also view the Moon from the Earth, Sun, night side, above named formations on the lunar surface. or as a map showing day and night. A related document compares the appearance of the Moon at perigee and apogee, including an interactive Perigee and Apogee Calculator."

Title: Extrasolar Planets Encyclopaedia Provider: Harvard-Smithsonian Center for Astrophysics Subject Heading/s: : Extrasolar planets LC Class: QB Reference Category: Encyclopedias Description: Informtion on planets and possible planets located outside our solar system from the Harvard-Smithsonian Center for Astrophysics.

Title: Nine Planets Provider: Students for the Exploration and Development of Space Subject Heading/s: Solar system LC Class: QB Reference Category: Encyclopedias Description: "The Nine Planets is an overview of the history, mythology, and current scientific knowledge of each of the planets and moons in our solar system."

Title: World Time Server Provider: World Time Server Subject Heading/s: Time LC Class: QB Reference Category: Databases Description: " Time Server provides the most accurate current local times of any world clock on the Internet. It makes real time adjustments for Daylight Savings Time." Keyword searchable, with country and city lists.

Title: Your Sky Provider: Fourmilab Subject Heading/s: Stars LC Class: QB Reference Category: Atlases Description: Provides three ways to view the sky as though from a city near you with links, where appropriate, among the various presentations: Sky Map, Horizon Views, and The Virtual Telescope.