Astrology is the study of the relative positions of celestial bodies as indicators of destiny, personality, human affairs, and natural events.
THE PRIMARY ASTROLOGICAL BODIES
The primary astrological bodies are the Sun, Moon, and astronomical planets. Astrology is often characterized as "reading the stars", but "stars" in this context refers to the word's oldest sense—that of any small bright point in the night sky whether it be a star, the Moon, a planet, a dwarf planet, an asteroid or another celestial body or point, as those terms are used by modern English speakers.
The Stars (other than the Sun) play a relatively minor role. The main focus is on the placement of the astrological planets (which includes the Sun and the Moon) relative to each other and to the signs of the zodiac, though the system also allows reference to fixed stars, asteroids, comets, and various mathematical points. As a practice, astrology is a combination of basic astronomy, numerology, and divination.