Sky View is billed as “the Internet’s Virtual Telescope”. It allows you to view pictures of celestial objects in multiple wavelengths. You can run it interactively, or download a Java version. If you find it confusing, choose the “non-astronomer’s” interface, & check out their orientation page.
Link to Sky View.
The SkyMorph on-line database enables searches for variable, moving or transient objects. It provides convenient access to optical images and catalogs generated by the Near Earth Asteroid Tracking program, including 1000s of images covering most of the sky. A bit clunky to use, but an amazing resource.
Link to SkyMorph.
US Navy Time Service Department:
Interesting stuff to do with time, what’s up when, and so on.
Link to US Navy time service department.
Virtual Moon Atlas:
Virtual Moon Atlas.
Link to Virtual Moon Atlas.
Students for the Exploration & Development of Space. See the Nine Planets solar system tour, and more.
Link to SEDS.
Astronomical Software and Documentation Service. A good set of software packages, documents, sites and manuals. Follow packages/utilities/Deep-SkyPlanner for a decent Deep-sky planner.
Link to ASDS.
Predictions & locations of the ISS, satellites, Iridium flares, comets & other objects, plus Sky charts
Link to Heavens Above.
Weather forecasts for just about anywhere on the planet. If you have your own weather station, you can join their network.
Link to Weather Underground.
The Eclipse Home Page, by NASA’s Fred Espenak.
Link to Eclipse.
INSTITUT DE MÃ CANIQUE CÃ LESTE:
Astronomy, celestial mechanics, ephemerides, calendars, solar system. There is English on the site, but it helps to know French.
Link to INSTITUT DE MÃ CANIQUE CÃLESTE.
Hawaiian Astronomical Society:
Constellations: Stories and a Deepsky Atlas.
Link to Hawaiian Astronomical Society.
Cartes du Ciel:
Sky Charts, freeware, Celestial Atlas.
Link to Cartes du Ciel.
SkyGlobe shareware – ‘planetarium’ simulation of the sky. This really useful DOS-based program is small enough to fit on a stiffy.
Link to SkyGlobe.
Que tap in the Current Skies observing guide.
Link to Que tal.
Moon phase calculator.
Link to Inconstant Moon.
The Nasa/Ipac Extragalactic Database. The name says it all. If you have a big scope, this is for you.
Link to NED.
Billed as “the most complete astronomical observations and on-line-calculator on the planet”. It probably is!
Link to Cal Sky.