Capricorn Zodiac Sign: Characteristics ... - Astrology.com In the modern astrology system of the Twelve Letter Alphabet, each zodiac sign rules one of the twelve houses in the birth chart. This innovation was created by psychological astrologers to match sign affinities to related house topics. Capricorn was assigned the tenth house of public status and career, since Capricorn’s earthy and ambitious pursuits are aligned with the …