Classical Planet

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The planets Mercury, Venus, Mars, Jupiter and Saturn which have been known since at least - and probably before - the rise of ancient civilizations. Astrologers added the Sun and the Moon to these, as "planets" in astrology if not in astronomy, making a total of seven, a number which is considered to have special mystical significance.

The ancient Greeks used the word planet - which literally means wanderer - to differentiate between other celestial bodies within our solar system such as comets and the so-called fixed stars, whose movements were routine and predictable. All of the seven classical planets are visible to the naked eye.

See also