What is a Planet?
In the earliest days of civilisation, when people first began to pay attention to the lights in the sky, they soon noticed that most of these lights seemed to hold their relative positions in a quite steadfast way. These they called the "fixed stars".
Others, including the sun and the moon, seemed to follow a livelier, more random pattern. These they called "planets", or wanderers. In astrology, the planets, sun, moon and other movable points (such as the moon's nodes) are still all described as planets, the wanderers of the zodiac.
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