In astrology, a natal chart is a stylized map of the universe with the "native" (the individual or subject to be studied) at the center. It is calculated for the exact time and location of the native's birth

Birthday

A birthday is a day or anniversary where a person celebrates his or her date of birth. Birthdays are celebrated in numerous cultures, often with a gift, party or rite of passage. Although the major religions celebrate the birth of their founders , Christmas – which is celebrated widely by...

 for the purposes of gaining insight into the native's personality and potential. Commonly used alternative names for the natal chart include birth chart, horoscope, natus, nativity, radix, geniture and genethliac chart, among others.