From the Big Bang to the present day. One picture, 15 billion years.
Doppler Wave Fronts
Simple representation of the doppler effect caused by a car moving
Length of Day
A clever animation showing the sun's shadow across the earth together with the earth's relative position in its path around the sun and a running calendar.
Short animated file explaining all forms of line spectra
A great little animation that can be used at a variety of levels from showing asteroids at the simplest to more complex relationships between planet, sun and moon, as well as user-defined plots.
A straight forward clip showing a polar orbitting satellite passing along (around) the earth from pole to pole several times in a day.