The sun () is considered a very important part of
astrology. It is the most important of the astrological
planets. In Roman mythology the sun was represented by
Apollo, the god of light and
Helios the god of the sun. The Sun is the star at the centre of our solar system, around which the Earth and other planets revolve, and which provides us with heat and light.
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Planets in astrology have a different meaning to the modern
astronomical understanding of
what a planet is.
Astrology utilises the ancient
geocentric model of the universe in its calculations and thus employs the term in its original geocentric sense. Before the age of telescopes, the night sky was observed to consist of two very similar components: fixed stars, which remained motionless in relation to each other, and wandering stars, (in
ancient Greek: asteres planetai) which appeared to shift their positions relative to the fixed stars over the course of the year. To the Greeks and the other earliest astronomers, this group comprised the five planets visible to the naked eye and excluded the earth. 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, making a total of seven planets. Astrologers retain this definition today.
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