TLEs can be used to calculate position and velocity in an earth centered
coordinate system, from which the position and velocity at every other time
in any other coordinate system can be calculated, favorably by numerical
means. The limit of accuracy is given by the initial position and velocity
which propably is not too good if the TLE it is based upon is only an
approximation, mainly because the calculation may have some chaotic
properties due to a short pass with the moon and a final orbit close to the
earth-moon-system.
During the Apollo missions there was measurement of at least the spacecraft
trajectory between earth and moon by Doppler radar. I would suggest to look
for such data first when one wants to calculate solar orbits of debris
stages. I do not know if the Horizons Ephemeris System gives this data for
Apollo stages.
Moritz Heger, Ingolstadt, Germany
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