According to Indian Astrological system, we confirm the Birth Star of Individual according to Moon's position at time of the birth. Influence of Planets on humans affects at the periodicity during his/her life time. This is also called "Udu Dasa System". Udu = Nakshatra / Asterism.
Planets - Ruling Period
Sun - 6 Yrs.; Moon - 10 Yrs.; Mars - 7 Yrs.; Rahu - 18 Yrs.; Jupiter - 16 Yrs.; Saturn - 19 Yrs.;
Mercury - 17 Yrs.; Ketu - 7 Yrs.; Venus - 20 Yrs.