Okay so you must be wondering what is the AC!?
This is the sign that appears at the time of your birth! It represents your 1st house which represents who you are.
So essentially your sun sign is NOT the most important part of astrology (though I'm sure the sun thinks it is!) but a combination of your AC sign AND your Sun that makes up your personality.
For me, I'm a Leo, born August 6th, 1984 at 8:15pm. My AC is Aquarius, so you might say I'm an intellectual Leo . . . but either way I am a paradox!
So, what about your AC sign? Would you like to find out? You can run your birth chart here at www.astro.com to get the results!