Depending on what time you were born, you'll have a different rising sign from someone else with the same birthday.
Say your birthday is Aug. 3. While the sun might have been in Leo, the moon, which moves pretty fast — it switches signs every two to two-and-a-half days — could have been in mutable water sign Pisces or cardinal air sign Libra. And the rising sign, which is the sign that was rising (or ascending) on the eastern horizon at the time of your birth, shifts throughout the day, spending about two hours in a sign. Depending on what time you were born, you'll have a different rising sign from someone else with the same birthday.