If sun is electricity to a television then moon is the signal. What good is the T.V. and electricity if the signal is not there to show you the picture? Remember, life only occurred on this planet when moon and sun were at the exact distance to create a total eclipse on earth. Three are lot of theories that moon might have been bought here from another intelligent alien beings since moon is now thought to be hollow with hydraulics installed inside, but these are just theories and speculation like in the science books, that moon was created from a collision. The fact is moon is affecting everything on planet earth, from weather, ocean tides and our minds.
In astrology moon controls the mind and moon rules the mind. Do not mistake intelligence vs. mind. Intelligence is controlled by Mercury, while moon controls how we think. When wanting to find out about how someone thinks, the best and easiest thing to do is find out their ‘moon sign’. The moon sign house and sign placement will give 85% of their thinking patter, personality and attitude towards life. Although degrees of the moon, ascendant also do matter, the moon sign still holds a major makeup of a person’s personality. Moon is excelled in 2 degree Taurus, and debilitated in 10 degree Scorpio. This may not be as accurate anymore as it used to be in the ancient times. Weak moon doesn’t mean a weak mind; it just means a different type of wavelength. Moon in Scorpio person is known to be scared of lot of things, and has the fear of unknown, or may love the deep dark secrets of the world, however, since moon is water, and mind, it can be influenced and turned into a different shape even if it’s excelled. If moon is weak in the horoscope, then you must also look at the aspects on the moon, meaning, which planet or any is looking at the moon, which planet is sitting in the same house as the moon or which planets are in 2nd or 12th house from the moon. All these factors will change and mold how a person thinks. If a weak moon is being aspected by Saturn or Rahu, then yes, it’s a very badly damaged moon which can create chaotic thoughts in the person, makes them crazy and sometimes even murders and killers like Casey Anthony. If moon is hemmed between Saturn and Mars in the same house, then it can make a person bi-polar or give them suicidal thoughts. When studying the moon in ones chart, you can not just look at its house, sign and degree placements; you must study all the factors I described above.
If a weak moon is stilling in a bad house, but, it is being asepcted by Jupiter sitting in good house, in its excelled or strong position, it will take away over 75% of all bad effects of the moon, perhaps even more, depending up on the degrees of Jupiter. It can also be visa-versa, if a excelled moon is being aspected by Saturn or Rahu, then it will take away majority of the good qualities of the moon.
Moon also represent the mother, or a motherly figure, and when badly placed, it creates tension and problem between the native and their mother.