Excerpt from my latest Sasstrology article (please leave comments on the Sasstrology site):
"Is natal Moon in Capricorn the same as Moon conjunct Saturn? What about Venus in Scorpio versus Venus square Pluto? You’d think a planet in a sign would act the same as that planet aspected by the sign’s ruler. While there are general similarities, the two situations are really quite different. Assuming that Moon in Capricorn has the same emotional issues as Moon/Saturn can result in misleading relationship assumptions. Fortunately, it’s easy to understand the difference, once you understand how signs and planets work."