A full reading for Rooster × Sagittarius meeting Rat × Capricorn is on the way. In the meantime, the score above is computed from the canonical element matrix and sign-cycle distance, and the profiles below cover each side individually.
You cannot tell a lie, or at least, you cannot tell a lie that sounds like a lie, although you wish you could. The honesty of the Rooster/Sagittarius, though greatly valued by others (especially your adversaries), is the bane of your existence. Luckily, you are a bundle of incurable typical Sagittarian optimism, so this doesn't bother you as much as it would a different DoubleSign. Try to figure out the mannered anodyne of the "white lie" -- it'll spare your relationships many an unintentional headache.
Power for its own sake, and the cold brutal solitary serenity that accompanies such an exalted position, are precisely what the Rat/Capricorn lives for. If they think they've seen goals-oriented people in action before, they haven't seen anything until they've seen the Rat in you breeze past them on your way to the top, in such a way as to make Genghis Khan seem mild-mannered, of whatever hierarchy to which you see fit to belong.