The Earth (Terra):
http://en.wikipedia.org/wiki/Earth
Rotation period at the equator (around its axis) = around 24 hours
Rotation period around the Sun (sidereal rotation) = around 365 days

The Moon (of the Terra):
http://en.wikipedia.org/wiki/Moon
Rotation period around the Earth (Terra) (sidereal rotation) = 27.3 days
Synodic rotation = the time between two conjunction (Moon-Sun) is
greater the the sidereal rotation of the Moon and is variable due to
several factors; is around 29.5 days
http://en.wikipedia.org/wiki/Synodic_month#Synodic_month

So, the Sun is our star and the Earth together with its moon is
rotate around it and the Moon is rotate around the Earth. Also, the
Sun, the Earth and the Moon rotate around there axis.

Having the above data we can see that the 27 to 29 days period that
we discuss about is the Moon sidereal and synodic rotation and could
be the Sun rotation too.

Now, let assume that the Sun effects on MW propagation are well known
(is not the case but...), I'm interested if some one can explain
me(or pointed to a WEB resource) what is the Moon's (Terra moon)
influence on this propagation.

Many thanks.