Most people know the Zodiac Sign under which they were born, in other words, the Zodiac Sign where the Sun was at the time of their birth. However, the most important individual fact for a person is the Ascendant Sign.
The Ascendant is the sign that rises in the horizon at the exact time of one's birth; that's why, the hour and minute of one's first breath is so important to calculate in a Natal Chart.
In physical reality it is the image of the extremities of the horizon line devised in a vertical plane that separates the visible and invisible sky. This division originates the Houses and the Ascendant, also known as the First House.
The ascendant expresses personality. It is an important feature, because it shows the behavior that is learned as well as the way we are perceived by others. It is also related to the manner we begin things. Besides, it gives the idea of our personality apparent to others; physical appearance, temperament; one's natural disposition.