Birth Chart is known as Rasi Chart or Natal Chart. Most of the Vedic astrologers following this Rasi chart to analyze future predictions of life. A birth chart represented by various names such "Kundli" or "Jathakam" or Jathaka or Rasi circle or Rasi chart. In Vedic Astrology Birth Chart explains the positions of the stars/planets at your time of birth in the place you were born. To generate the correct Rasi chart the following details are necessary: 1. Exact Birth Date & Time 2. The timezone of the birthplace. 3. Geolocation (latitude & longitude) of the birthplace. 4. Sun rising time of the birthday (Sun's position(Degree) from the birthplace aspect).
In Indian astrology, predictions are based on the Moon and Ascendant (or Lagna). Lagna/Ascendant is the degree of the sign(Rasi) which is rising on the eastern horizon at the time of one's birth. It's mainly based on Sun & Sunrise time & birth time of the day of one's Birthday. Anyone's Rasi or Sign is calculated from this Birth Kundli. The Sign in which the moon is placed in Rasi chart is known as person's Sign.