I have been asked by several teachers if there is a good way to use Celestia to display the advance of the seasons for use in the classroom or computer lab. I am happy to report that there is. It takes a bit of setup, but once done, it works very well.
I have posted a tutorial on how to do it, in the Tutorials section of this forum. Just go to http://www.shatters.net/forum/viewtopic.php?f=21&t=15711
Enjoy
Frank