the representation made of the aspect of the heavens at the moment of a person's birth, by which the astrologer professed to foretell the events of the person's life; especially, the sign of the zodiac rising above the horizon at such a moment.-the diagram or scheme of twelve houses or signs of the zodiac, into which the whole circuit of the heavens was divided for the purposes of such prediction of fortune.-the planisphere invented by jean paduanus.-a table showing the length of the days and nights at all places.