It takes the preskew of 7.5 degrees of the astra satellites into account, which is correct. (Satlex does this also.)

Alas, it does that also on the multifeed skew calculations, IIRC, where the preskew should NOT be taken into account.

(Multifeed skew calculation is in fact still more complicated than that, I believe. Maybe the Cahors Big Bisat calculator is the most accurate for that, I'm not sure yet, as I haven't been able to check calculations and outcomes of that...)

I don't know of an internet calculator, that takes the Eutelsat satellites preskew of 3.535 degrees into account.

In fact it seems to be a little known fact, that they also have a preskew, but Eutelsat reported it themselves.

Greetz,

A33