May 16, 1988 |
Astrology is based on the theory that the sun, moon, stars and planets influence human affairs. To calculate that influence, astrologers cast a birth chart, known as a horoscope, showing the positions of the sun, moon and planets in relation to the Earth and stars at the time of a person's birth. The horoscope includes a Zodiac, divided into 12 equal signs (Aries, Cancer, Leo, Aquarius, etc.) and 12 houses representing the Earth's surface.