The science of astronomy together with the pseudo-science of astrology, as developed by the Greeks and the Arabs. [The observation of celestial bodies and their movements and configurations, of their influence upon climate and tides, etc., the theory of the spheres, etc., constituted the field of 'natural astronomy'; the divination of human destiny, the casting of horoscopes, etc., by inference from the configurations of celestial bodies were known as 'judicial astronomy'. The terms astronomie and astrologie were used interchangeably (as in ML), although in the 15th cent., when astrological lore came into disrepute, some writers make the modern distinction.] (a) Astronomy together with astrology (one of the 'seven arts' in the curriculum of the medieval university); dom of ~, an inference from astronomical observations as to future events, destiny, etc.; (b) astronomy; (c) astrology; divination.

An astronomical chart.