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Mercury Conjunct Mercury Synastry: Relationships and Friendships Explained

No matter what the relationship is, Mercury conjunct Mercury is an excellent aspect to have in synastry.

While Venus and Mars are the primary planets when it comes to attraction and relationship formation, it is Mercury that determines whether a relationship will last.

This is because Mercury is the planet that governs communication.

A conjunction occurs when two planets are in the same place in the zodiac.

Mercury Conjunct Mercury in Synastry

When Mercury is conjunct Mercury, it will usually be easy for two people to talk to one another. They think alike and have the same communication style.

It is not uncommon for two people with this aspect between them to be able to complete each other’s sentences.

This aspect will promote excellent communication.

In most cases, the two will be able to talk through whatever difficulties they may have. They will also often have many common interests.

Mercury can never be more than 28 degrees from the Sun. This means Mercury will either be in the same sign as one’s Sun or one of the two signs adjacent to one’s Sun.

This will have an impact on Sun Sign compatibility.

In most cases, adjacent signs are incompatible with each other. On the other hand, if two people have their Sun in adjacent signs, they are likely to have Mercury in the same sign or even conjunct.

This will negate many of the problems that they might otherwise have. They will be very different, but their excellent communication will enable them to navigate these differences.

A Note About Combustion

Because Mercury can never be more than 28 degrees away from the Sun in anyone’s chart, it is often in a state that is known as Combustion. A planet is Combust when it is within eight degrees of the Sun.

Combustion is a serious debility to a planet. Mercury handles it better than most, but it still can be damaging to a person’s ability to communicate.

There is a good chance that one or both of the people involved in a relationship will have Mercury combust in their birthcharts.

If this is the case, it will complicate the beneficial effects of this aspect. In many cases, pride and ego will get in the way of what would ordinarily be excellent communication.

If both people have Mercury Combust, it will usually be the case that their Suns are conjunct as well. This can be positive, negative, or neutral depending on the sign involved.

Exceptions to Combustion

There are two exceptions to the rule that a planet within 8 degrees of the Sun is Combust.

The first and most common is when the planets are within 8 degrees but in two different signs. For purposes of determining Combustion, sign boundaries act as an invisible wall.

The second exception is known as Cazimi, which means in the heart of the Sun. If a planet is within 17 minutes of the Sun, it is in a special protected place. It is not only protected from Combustion, but it is enhanced and strengthened.

House Position

Mercury conjunct Mercury will take on different meanings depending on the house position it is found in each person’s birthchart.

To learn more, see:

Mercury in Houses Synastry Meanings: 1st through 12th House

Man’s Mercury Conjunct Woman’s Mercury Relationship

Mercury conjunct Mercury is a beneficial aspect for any relationship, but it does not necessarily generate romantic feelings.

Depending on the other aspects that are between the charts of the couple, they may start as friends. Early on, they will sense that they understand each other and that they can talk to each other about anything.

If other aspects indicate romantic feelings, the easy, friendly nature of Mercury conjunct Mercury will enhance them.

While this aspect is helpful in the early stages of a relationship, it really shines as the relationship gets deeper.

There is no such thing as a perfect relationship, even between people who are highly compatible. This is why communication is so important.

Mercury conjunct Mercury will enable people to talk to each other and work through their difficulties, increasing the likelihood that the relationship will last over the long haul.

Mercury Conjunct Mercury in Friendship

When two people have Mercury conjunct Mercury, it is very likely that they will become close friends.

They understand each other in a way that no one else really can. They also usually share at least some interests.

If either of them has difficulty communicating, the other will be able to help them articulate their thoughts and feelings.

Although this is a great aspect when it comes to comradery and good feeling between people, they may not give each other the best advice.

This is because they will tend to agree on most things, making it hard to offer perspective to each other.

How to Tell if Mercury is Conjunct Mercury in Synastry

If two people have Mercury in the same sign, there will be at least some of the influence of this aspect between them. They will think alike.

Mercury’s orb is seven degrees, so technically, the conjunction is not at full strength unless the planets are within seven degrees of each other.

The closer Mercury is in the two charts, the stronger the aspect will be.

If one person’s Mercury is at the end of a sign and the other’s is at the beginning of an adjacent sign, a “cross-sign” conjunction may be present.

A cross-sign conjunction between Mercury in the charts of two people will enhance their ability to communicate. On the other hand, it will not make them think alike or be able to complete each other’s sentences.


Mercury conjunct Mercury is a wonderful aspect to have in romantic relationships and friendships.

It helps to facilitate communication between people. People with this aspect tend to think alike.

In synastry, this aspect will enhance other positive aspects between people. It will also help them to navigate difficult aspects between them.

The excellent communication this aspect provides will go a long way towards promoting a long-term relationship or friendship. It will help them work through any problems that they may have.

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