In
astrological terms, a planet is in detriment when it is in the opposite sign of the sign it rules. The planet's energies cannot operate at full power and it can be confusing for the person with a planet in detriment. If you are the planet and the sign is someone else's home, you must conform to the rules and regulations of someone else's making and you are uncomfortable.
Planets in Detriment:
Moon in Capricorn
Mercury in Sagittarius and Mercury in Pisces
Venus in Scorpio and Venus in Aries
Sun in Aquarius
Mars in Libra
Jupiter in Gemini
Saturn in Cancer
Uranus in Leo
Neptune in Virgo
Pluto in Taurus