A Chart Factor is a general term for any component or calculated feature of an astrological chart that may contribute to its interpretation. Chart factors can include Planets, the Sun and Moon, calculated points such as the Ascendant and Midheaven, House cusps, Nodes, and other selected points used by a particular astrological system. Their meaning is usually considered through their Zodiac Sign, House placement when available, and the Aspects or other relationships they form with additional chart factors. Which factors are included can vary according to the type of chart, the astrological tradition being used, and the purpose of the interpretation.