Locating your rising sign

Where is a definite website where I can locate my rising sign? I've always wanted to know it, but many different sites give me a lot of random answers. Most tend to say that my rising sign is Leo.
Statistics: April 01, 1987, 12:59 PM, Gibraltar.

Hiya, MkM84! I'm talking about Gibraltar, Gibraltar. At the south of Spain, a British land. x