Ever wonder why some actors become stereotypically known for certain characters? Its largely because their Sun sign embodies the traits of that part. For example, think of William Shatner as Captain James T. Kirk. Capt. Kirk is a born leader, boldly going where no one has gone before. He's a little impulsive, has this fast way of speaking, and definitely courageous. What Sun Sign does that make you think of? Aries! William Shatner is an Aries Sun, but he actually has 3 planets in Aries, making him very bold indeed.
Or, Lucy Lawless who played Xena Princess Warrior. Lucy is a double Aries, with both Sun and Moon in that sign, making her the perfect choice to play a Warrior Princess.
James Caan is known for his role in the Godfather, but he has made a career out of playing bad guys and mob types. He too is an Aries, but he has 4 planets in Aries, and they all aspect Pluto, giving his Aries brashness a dark, controlling edge.