The ascendant is the zodiacal sign and degree that is ascending on the eastern horizon at the specific time and location of an event. According to astrological theory, celestial phenomena reflect or determine human activity on the principle of ‘as above, so below’. Wikipedia

How do you know your rising sign?
Your rising sign, also called your ascendant, is the sign that was rising over the eastern horizon when you were born. It can affect your appearance, your attitude, and the way you come across to others.