I don't know if you've ever used who signs; but you may want to try it. It simplifies a lot of things.
One sign, one house, however the cusp would be every 30 degrees from the ascendant. So, it is possible for the 27th degree to be considered the cusp, if a person were to have an ascendant at the 27th degree. I may not be explaining this right. A couple of beers in tonight. Sorry.