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Moon opposite Mercury is a challenging aspect in synasty. Despite this, it can indicate a very important and helpful relationship between two people.
Communication can make or break a relationship. The Moon and Mercury are the two main planets associated with communication.
Mercury is the planet that governs communication.
The Moon is one of the two Luminaries. As such, it has multiple significations. One of these is communication. As the quickest moving planet, it traditionally governed messages and messengers.
An opposition is complicated aspect. On the one hand, it is tense and difficult. On the other, it plays a special role in relationships by providing balance.
Moon Opposite Mercury in Synastry
When the Moon is opposite Mercury in synastry, the two people involved are bound to have misunderstandings and other problems with communication. This is almost inevitable.
The two will have a hard time seeing things eye to eye. To make matters worse, the two will not be able to “agree to disagree.”
Even so, this aspect is not all negative. Any connection between the Moon and Mercury can be helpful, even a difficult one such as this.
Even though the two will disagree on many things, this aspect will keep them talking to one another. This will keep them interacting, which will help to keep the relationship intact.
If both of them are open to change, this aspect can provide balance. They can help each other see things from a different perspective.
Planets are strong in the signs in which they rule and which exalt them, and they are weak in the opposite signs. Because of this, oppositions tend to have many special sign combinations in synastry. These special sign combinations will modify the meaning of this aspect.
Taurus/Scorpio and Cancer/Capricorn
The Moon is strong in Taurus and Cancer and weak in Scorpio and Capricorn.
If the Moon is in Scorpio or Capricorn, and Mercury is in Taurus or Cancer, it will make this aspect more positive. The person whose Mercury is involved will be receptive to the other person.
This aspect becomes more negative when the Moon is in Taurus and Mercury is in Scorpio. The two will have a great deal of trouble in being able to come to terms with their differences.
Gemini/Sagittarius and Virgo/Pisces
With these two sign combinations, it is Mercury that is the focus of the polarity.
Mercury is strong in Gemini and Virgo and weak in Sagittarius and Pisces.
Of all of the possible combinations with these signs, the best is Moon in Virgo and Mercury in Pisces. With this combination, the two will complement and balance each other. This will bring out the best in both of them.
Moon in Gemini and Mercury in Sagittarius is also a helpful combination. They will enjoy talking with each other even if they do not agree.
Moon in Sagittarius and Mercury in Gemini will make this aspect more difficult, and it will tend to keep their communication on a rather superficial level.
The most difficult combination is Moon in Pisces and Mercury in Virgo. In this case, the two are likely to have many painful misunderstandings which could threaten the relationship.
House Position
In addition to the special sign combinations, it is also important to consider the houses that the planets occupy in each other’s birth charts.
For more information, see:
Moon in Houses Synastry Meanings: 1st through 12th House
Mars in Houses Synastry Meanings: 1st through 12th House
Man’s Moon Opposite Woman’s Mercury Relationship
Moon opposite Mercury in synastry has the potential to prevent a romantic relationship from forming in the first place. Even though opposites attract, Mercury connections tend to be more cerebral than romantic.
This means that this aspect can create friction without also generating sexual tension.
Yet, this is only one aspect, and chemistry can come from other synastry aspects between them.
This aspect can be a challenge over time as well. He will have a hard time listening to her and will have a tendency to contradict her and dismiss what she has to say.
Yet, if the two can get beyond these challenges, this relationship has the potential to be helpful to both of them. They will have a natural ability to see each other weaknesses and to complement each other.
Woman’s Moon Opposite Man’s Mercury Relationship
This combination can seem less problematic than is the case when the genders are reversed. It is less likely to prevent a relationship from forming.
Even if she is not really listening to what he has to say, she will generally be able to give him enough attention so that he feels listened to.
It will be important to look for the other synastry aspects to determine whether there is chemistry or long-term potential for the relationship.
If the relationship does develop into a long-term one, communication problems are likely to arise. It will be important for the two of them to work hard to talk to each other and try to understand their differences.
As is the case as when the genders are reversed, if the two are able to work through disagreements and misunderstandings, they can be quite beneficial to each other.
Moon Opposite Mercury in Friendship
Moon opposite Mercury is better in friendship synastry than it is in a romantic relationship.
It could still prevent a friendship from developing or deepening, but if it does not, the two will be good for one another.
They will be very different, and they are likely to have many disagreements. On the other hand, these disagreements can be helpful to both of them.
It will be good for them to discuss matters between them. When giving advice, they will often play Devil’s Advocate for each other, but this will help them to see things from different angles.
Over time, they will learn to respect each other’s opinions, even if they do not often share them.
How to Tell if the Moon is Opposite Mercury in Synastry
Each sign has its opposite sign. The opposite pairs are shown in the graphic below:

If the Moon and Mercury are in these signs, this aspect will be present to a certain extent. The allowable margin of error for aspects between these planets is nine degrees.
The closer the aspect is to exact, the stronger it will be. Unlike many other hard aspects, a close opposition between these planets is more favorable.
The reason for this is that this will make it easier for them to connect with each other, even if they disagree.
It is possible for these planets to be within nine degrees of each other from the wrong signs. If this happens, it will tend to make the aspect more difficult. The two will have an even harder time seeing eye to eye.
Conclusion
Moon opposite Mercury is a difficult aspect in synastry. However, it can also be beneficial, even if it is not always pleasant.
The two will have many disagreements, but if they can get through them, they will balance and complement each other.