Try the Ogg Theora format; that's an open standard that is widely supported, and there are players available for all platforms. If you don't have a plugin for the others, , the MPEG1 version will almost certainly work, but it's a lower quality.
![[Image]](/~rknop/big/astromovies/celsphere1.jpg)
This is a movie designed for use in a lecture on the celestial sphere. It starts with the celestial sphere— a bunch of stars on a spherical shell around the Earth, gridded by RA and Dec. It zooms in and out, attempting to connect features of the Earth (poles, equator) with features on the Celestial Sphere. As the sphere rotates, it tries to connect the motions of the sphere to what would be seen by an observer in the Norther Hemisphere.
As with all of these movies, there is no narration or sound. It's designed to be used by a lecturer, who will pause it at opportune places to discuss it or ask questions of students.
Earth texture by Rick Kohrs.