Motion in Celestia

[buggs_moran]

I am brainstorming a idea for an addon, but I need cyclical linear motion (i.e a repeating movement in one direction without start and end dates). As far as I can figure there are three methods of motion in celestia:

1) Orbiting/Rotating an STC generated object.
2) Orbiting/Rotating an SSC generated object.
3) An XYZ file (and correct me if I am wrong, is this limited to Sol?)

Is that it? If so, I may need to employ sneakier methods for acheiving what I want...


AND can someone with a higher astronomy knowledge than me (99.9% of you) please answer this post http://www.celestiaproject.net/forum/viewtopic ... ght=#58739