14 Nov
2008
14 Nov
'08
10:55 p.m.
Eric,
The moon (and sun!) are sufficiently massive that you can't make the same simplifying approximations. Many programs such as ITrack, SATPC32, Nova, Trak-SM, etc, all have the capability to generate the required data using different algorithms which do not require updating. At one time I saw a program which would generate pseudo-Keps which were good for a few days, but I am not certain if that still exists somewhere.
Alan WA4SCA