This is the Rudraksha ruled by earth, a planet of our physical location. Earth is not considered in Astrology however the birth chart is drawn on the date, time and place of birth. We live on the earth. Astrology is the study of movements of planets and their effects on the people on the earth. Earth is our mother planet. Whatever we achieve, achieve on the earth. If earth is favourable everything can be achieved. Therefore 18 Mukhi so important bead.