The term "sep 11 2003 zodiac" functions grammatically as a noun phrase. The head noun is "zodiac," which is specified by the adjectival modifier "sep 11 2003." This date-based modifier pinpoints the specific astrological sign being referenced.
In Western astrology, the zodiac sign for the date September 11 is Virgo. The Sun transits through Virgo annually from approximately August 23 to September 22. As an Earth sign ruled by the planet Mercury, Virgo is associated with traits such as meticulousness, practicality, analytical thinking, and a diligent nature. Its ruling planet imparts a focus on communication, reason, and detail.
Consequently, an individual born on September 11, 2003, is identified with the sun sign of Virgo. Any astrological interpretation for a person with this birthdate would be based on the characteristics, symbolism, and planetary associations of this specific zodiac sign.