Welcome to Solar System Live, the interactive Orrery of the Web. You can view the entire Solar System, or just the inner planets (through the orbit of Mars). Controls allow you to set time and date, viewpoint, observing location, orbital elements to track an asteroid or comet, and a variety of other parameters. Click on the title of any control to display a help page explaining it, or go directly to the help table of contents. You can compose a request with custom settings and save the results in your browser's hotlist or bookmark table, allowing direct access to Solar System Live with all the controls preset to your own preferences. You can plot the orbit of an asteroid or comet by choosing it from the object catalogue and clicking the “⊚” (orbit) button.

Other astronomy and space software available from Fourmilab includes:

• Earth and Moon Viewer
• Terranova: a new terraformed planet every day, and Terranova Planet Maker
• Your Sky makes custom star maps for any location on Earth at any date and time