As I understand it, your Ascendant depends on the hour you were born. If you look up the time on your birth certificate, you can get your whole chart at Astro Dienst. It's really interesting stuff. Let me know what you find. ;)

Edit: Sorry, I should add-- go under "My Astro" and create a user profile. On page 4 of the scrolly-thingy in the center of the site's main page has a link to draw your chart (I can't find it on the side bar for some reason O_o;).