Kartik month starts in Mid October at sankranti and ends approx in Mid November at next sankranti. When a native is born in month of Kartik he/she is known to have Kartik Dosha because During this solar month The Sun transits the Libra sign. Sun is considered to be debilitated in Libra sign. Debilitated Sun is not good. Because Sun is the karaka of health, vision, Father, seniors, Govt. related works and name fame.