Aspects.

At another forum, I asked a question regarding the significance of a Saturn-Venus-Mercury Grand Trine which, I thought, was apparent in my chart, but to my surprise I was told that such an aspect is actually impossible to occur astrologically, and what is visible in my chart is a T-Square configuration.... So, once and for all, is such a Grand Trine possible or not?, and if either or both aspects are existent in my chart can somebody, please, explain to me the significance of it/them?

If you'd like to investigate my chart:

May 10, 1986
12:44 a.m.
New York, NY, USA

Thanks!, Jessica =D