In
astrological terms, a planet is said to be in fall when it is in the
sign opposite where it is in it's
exaltation. The planet has difficulty expressing its nature. If you think of yourself as being the planet and the sign the planet is in being a house, you are in fall if you have to stay in someone else's house and you don't feel comfortable there.
Planets in Fall:
Moon in Scorpio
Mercury in Leo
Venus in Virgo
Sun in Libra
Mars in Cancer
Jupiter in Capricorn
Saturn in Aries
Uranus in Taurus
Neptune and Pluto are the slowest moving planets in the system. As a result, not enough time has passed since their discovery to accumulate information on where these planets are in their fall.