Astronomical Algorithms, Tables of Meeus

[Gil]

Interesting, indeed.
A lot of work, sure.

As I am no astronomer, I just used some of the given algorithms.

I used, in particular, the ones given for the axial tilt and tropical year.

Then I found some newer, for example contacting directly IMCCE.

When trying to improve the seasons calculations (my prior version being based on simplified Meeus' algorithms, with results correct to about 10-50"), now with tables given by Meeus at the end of his book, I mixep up different theories.

A very bad idea!

With this confusion, I could not find (of course) the exact result given by Meeus
(normally within 2-3" in within with apparent sun longitude = k×90) with his Bretagnon's simplified tables.

Fortunately, I understood my error... including two digits inversions.

Therefore, soon I will be able to publish a new version of EPHEMERID, with quite accurate seasons begins, in both TT/DT & UT, with an error of about 2-3".

Regards,
Gil