Re: Problem Calculating a Moon's Position

What is spherical aberration in this context?

I though spherica aberration was an imperfection in optical systems....

Yes, you are right. In both cases where this appeared I ment of coarse
STELLAR aberration.

One possibility yu may have not considered: perhaps Calsky has an error
when computing astrometric positions for the Moon?

I questioned that several times, but each time CalSky was right, also
in this case.

Yes, what you suggested would also be a solution. I would prefer the
straight forward approach, since the two set of results (astrometrical
and apparent) are calculated at two different instances (with the same
program parts). If I really wouldn't be able to succeed it would
however be a workaround to think of.

.