 determine who they are? Not really, because, well, if somebody doesn't have their birth time, we can go with the solar chart. But if they have their birth time, then I can see where their moon is, I can see their house cusp, I can see where, I use a few other little weird things like Eris, E-R-I-S, wherever she shows up in a chart, that's usually where somebody's going to come and bring their Trojan horse with them.