Your Birth star is the constellation the Moon was in, at the time of your birth. It is an important key in Vedic Astrology, as it gives a very unique profile of how your mind works. It will be a key indicator of how your good days and bad days will be; it will affect how planetary influences unfold in your life, and are used in compatibility analysis. In India, your Birth star would definitely have been taken into account in naming you as a baby as well as in selecting your marriage partner.