A full reading for Rat × Capricorn meeting Horse × Libra 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.
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.
The Horse/Libra has the great good fortune to be the most physically beautiful of all the DoubleSign combinations. Indeed, there isn't a shop window that you can pass by without glancing into it in order to examine your own reflection. In an age without recognized courtesans, you are an ambulatory Versailles. It will be incumbent upon you to recognize the characteristic vices of the essentially Libran courtesan -- vanity, frippery, cattiness, shallowness -- and neutralize them before they become a way of life for you.