[NTG-context] Aligning titles so that they begin in the margin rather at text edge

Hey all, a very simple problem, really, but one I'm having trouble finding examples for. I would like to set up my titles to begin in the margin, rather than at the text edge, similar to what is found in Bringhurst's _Elements of Typographic Style_. I'm pretty certain the solution is incredibly easy, just not so obvious for newbies like me. I will immediately post the solution to the Titles wiki page. Adv-THANKS-ance, John