The Physics To Go website will be unavailable Friday evening through Saturday afternoon as electrical work occurs in the American Center of Physics server room. Down time will begin at 6PM Eastern Time on Friday. Service is expected to resume by 6PM on Saturday, July 30.
This site, from Case Western Reserve University, is an applet that simulates the observation of Jupiter's Galilean moons. The visitor can step through the simulation and observe the moons' positions at different times. The applet automatically plots the distance of each moon from the planet as a function of time.
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