--- In guide-user@yahoogroups.com, "Valerio" <agrafoi@y...> wrote:

> Hi everybody!
> I'm a new member of the list from Italy, so I should apologize myself for=

m=

> y coarse English.
> I need your help to have a serie develop of a formula to calculate the lu=

na=

> r orbit inclination.
> I know its mean inclination is about 5°.1453964 with a wobble of + or - =

0°=

> .0025 in a period of 173.5 days, but I can't calculate it each instant.
> Moreover, I need help about the periodic and secular lenght variation of =

th=

> e semi-major axis of lunar orbit.
> I can calculate every other data of the lunar orbit in each instant, but =

th=

> ese.
>
> Thanks for your help
>
> Ciao
> Agrafoi

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I have found this formula to calculate the lunar orbit wobble, due to L. V.=
Morrison:

Perturbation = 8.65cos(2Lsl) - 0.70cos(2(Lml-L sl))+ 0.65cos(2Lml) [']

Lsl: Sun's longitude measured from the longitude of the lunar node
Lml: Moon's longitude measured from the longitude of the lunar node

I know how calculate Lmi, but I don't understand what does Lsl mean.
Anibody knows to explane me it?

Thanks
Agrafoi