


The planets are also related to each other in the form of aspects. They express themselves with different qualities in the twelve signs of the zodiac and in the twelve houses. To modern astrologers, the planets can represent basic drives or urges in the unconscious, or energy flow regulators representing dimensions of experience. To ancient astrologers, the planets represented the will of the gods and their direct influence upon human affairs. Astrologers retain this definition today. Although strictly, the term planet applied only to those five objects, the term was latterly broadened, particularly in the Middle Ages, to include the Sun and the Moon (sometimes referred to as "Lights", ) making a total of seven planets. To the Ancient Greeks who learned from the Babylonians, the earliest astronomers, this group consisted of the five planets visible to the naked eye and excluded Earth. Before the age of telescopes, the night sky was thought to consist of two very similar components: fixed stars, which remained motionless in relation to each other, and " wandering stars" ( Ancient Greek: ἀστέρες πλανῆται asteres planetai), which moved relative to the fixed stars over the course of the year. Planets in astrology have a meaning different from the astronomical understanding of what a planet is.
