Ascendant
The Ascendant (or rising sign) is the zodiac sign that was rising on the eastern horizon at the exact moment of birth. Together with the Sun and the Moon, it forms the "trio" of essential astrological coordinates. Represents the social mask, the first impression you make on others, and the way you face the world.
How is it calculated
The ascendant depends on the exact time and place of birth. Changes every ~2 hours, passing through all 12 signs in 24 hours. Without exact time, the ascendant cannot be precisely calculated.