The Sixth Chakra is our center of intuition, and a way of connecting with non-local phenomena and knowledge. This is one of the reasons for the assignment of the High Priestess with this chakra. I posted about the High Priestess here, discussing her association with intuition (the Third Eye). Her position on the Tree of Life acts as a transmitter of Divine wisdom into human nature.
However, there is also an association with memory, both individual and collective, in the
High Priestess. Where better to place this than smack-dab in the middle of your head?
The Moon is linked in astrology with emotion, and where the Moon is in our natal chart tells a good bit about how we deal with emotion. The Moon is also symbolic of the Mother energy in astrology (Saturn is the father). The sign of Cancer, which the Moon rules, is described as a maternal sign, centered around the home and nurturing.
Balance is important here as well. Too much Moon leads to an over-emotional, unfocused life; too little Moon yields an uncaring, unimaginative one.
The metal of the moon is silver, the “other” precious metal. Like gold, humans have a special affinity for this metal, and it is an even better conductor of electricity than copper. Gold and silver are also the colors of the so-called solar and lunar currents (masculine and feminine; yang and yin) of the body. Their interplay keeps us in balance. Too much (or too little) of one or the other leads to disruptions in many of our natural cycles, resulting in illness or emotional instability.
The note of the Moon is G#, placing it directly between Venus (F#) and Jupiter (A#). Thus, the three brightest non-solar objects are placed as a stellium (another astrological term) within the musical scale.
Never lose touch with the Moon of your being. It is your emotional center, your intuitive feel, and your link to Cosmic Memory.