In astrology, a natal chart is a horoscope/astrological chart drawn for the exact time of an individual's birth at a particular place on Earth for the purposes of gaining information about the individual.
Because the Sun, Moon, planets, and primary angles in the sky are constantly in motion relative to the earth, as each second passes the natal chart/astrological chart is changing (albeit slowly) and a new chart is created for every moment at each location. A natal chart is extremely personal and unique, depending on the specific date, exact time, and precise location of the birth. Even the birth charts of a pair of twins are often slightly different due to the fact that one of the twins is usually born a few minutes apart from the other.
When calculating a natal chart, the time of birth is critical. The time of birth can usually be found on the birth certificate in many countries. To get an accurate natal chart and report make sure that you enter the correct birth time.