In classical astrology
there are seven planets: the Moon
, the Sun
. In Astrology the Moon and the Sun are planets and Earth
is not. Originally, the planets were defined as visible objects in the sky
whose position would change relative to the background of fixed star
The outer planets which cannot be seen with the naked eye and were discovered in the past three centuries have since been incorporated into astrology; however, because their years are so long there is still debate about the forces they represent.