Hi all was wondering if anyone could give some insight to the upcoming change of signs for Rahu?

Rahu for me will be in the sign of my moon for the next 18 months while i am running a moon mahadasa. (saturn antardasa til mid dec and mercury antardasa from then thru 2010)

I assume the moon mahadasa means this transit is more significant for me?...... especially since my navamsa lagna is cancer (ruled by the moon) (Moon in leo in D9 moon in Saggittarius in D1)

Additionally my D1 lagna is pisces ruled by jupiter and my D1 moon is saggittarius ruled by jupiter too. (jupiter in leo in D1, jupiter in cancer in D9) So is jupiter a significant factor to consider? .......How does jupiters change of sign to aquarius in december contribute?

Any insight into this would be greatly appreciated. Many thanks. Katey.