Birth chart, which is also called the natal chart, is a chart that shows you the position of the stars at your time of birth in the place where you were born in. The birth chart calculates the personal natal chart and encourages you to get an explanation of what means as the meaning for your star signs.
If someone asks for your sign, or what your sign really defines or means, they probably be asking where the Sun is in placed in your birth chart. It is easy for some other people to answer, because the sun travels throughout the entire Zodiac over the course of the year, enabling it to stay at its course through the heavens entirely regular and predictable.
Some astrologers say that understanding your birth chart is important since it will give you guide whether your nature of birth is unique and has a better or wider emphasis on the horoscopic chart.