Sun Conjunction Mercury Synastry: When Who One of You Is Meets How the Other Talks, Very Closely

Synastry sets two birth charts side by side, and this contact joins one part from each. The Sun stands for who a person is: their core, what they stand for, the way they carry themselves. Mercury stands for how a person thinks and talks: the words they pick, the questions they ask, how they explain, listen, joke and swap information. In Sun conjunction Mercury, one person's Sun is within a few degrees of the other person's Mercury.

Two points that close usually share a sign, and so they share an element (fire, earth, air or water) and a way of moving. (Usually, not always: a conjunction that starts near the edge of a sign can reach into the next one.) That is the geometry. The reading built on it is fusion or mirroring: the way one of you is and the way the other speaks come from the same sign, so the words may sound like the person.

A remark from this person may stay with you longer than the same remark from someone else, and a plain statement of what you are like may be heard with unusual accuracy.

Friends, siblings, colleagues, classmates, a parent and their child, and partners can all share this contact, and it is one contact among many in any two charts.

In this contact one of you brings the Sun and the other brings Mercury, very close together. Call them the Sun person and the Mercury person.

If you are the Sun person, you are simply getting on with being yourself: what you care about, how you spend the day. Around the Mercury person, that may find a name. They may come up with the phrase for what you are doing, or ask the question that fits it. You may feel well described, and now and then described a little more firmly than you would have put it yourself.

If you are the Mercury person, you are thinking and talking: turning things over, asking, explaining, passing on what you have noticed. Around the Sun person your words may seem to have a subject close at hand. You may find yourself saying more, and more directly, than you do elsewhere, and notice that it is remembered.

If the link also runs the other way, from the Mercury person's Sun to the Sun person's Mercury, each of you is both.

In a conjunction the being and the saying sit so close that it can be hard to say where one stops and the other starts. Each of you may give the other something, and at different moments each of you is on both sides of it.

The Mercury person may give the Sun person words. Something the Sun person has long been, without a name for it, may be given one, and a decision they were circling may be put in a sentence they can use.

The Sun person may give the Mercury person a subject worth the words. What the Mercury person thinks and says, in this company, may come out sharper, because it is aimed at someone.

Either of you may want a remark taken as one way of putting it, and not the last word on who is who. The Sun person may also want to be understood as well as described. With so little distance between speaker and subject, both wants can carry extra weight.

These are sketches, not reports: illustrations of how a very close meeting of person and speech might show up across different kinds of pairs.

• Colleagues. At a team introduction, one colleague sums up the other's project in four words. The other had never found a short way to say it, and uses the same four words for the rest of the year.
• Flatmates. One flatmate starts calling the other's weekly baking "the Thursday loaf". The other had not thought of it as a habit until the name turned up on the calendar the following week, with a small loaf drawn beside it.
• Tutor and student. A tutor remarks that a student's essays sound like someone explaining something to a friend. The student goes back to the draft, finds the description fits, and reads the next paragraph aloud before writing it.
• Friends. One friend is unsure about applying for a course. The other says, in passing, "you'd be good at that", and the sentence is still there a week later, when the form is filled in.
• Siblings. Two siblings write the newsletter for a village club. One reads the draft aloud and the other hears their own way of putting things in it, although no line was borrowed.

In each sketch what one person is and what the other says seem to come from nearly the same place.

Because a conjunction usually keeps to one sign, that sign's element tends to shape the whole contact, and both of you are in it. In plain terms: fire is enthusiasm and action, earth is practical steadiness, air is talk and ideas, water is feeling.

Fire. The person and the speech are both quick and bold. The Mercury person may say outright what the Sun person was about to do. It might look like two members of a canoe club deciding the route at the slipway, each finishing the other's sentence about which bend.

Earth. Both are plain and deliberate. The Sun person's steadiness may be described in exact, unfussy words. It might look like a mentor and a trainee at a workbench, where one remark about how a joint is made becomes the way the trainee thinks of the whole craft.

Air. The person is curious and the talk is curious too. The Mercury person's questions may turn the Sun person's ideas round until they can be seen from the side. It might look like two volunteers who stay behind after a library book sale, and find that their ideas for the next one sound clearer said aloud to each other.

Water. Both go by feeling, and the words carry a mood. The Mercury person may find a phrase for what the Sun person has been feeling and not said. It might look like two old friends on a long phone call, where one says "you sound like you used to" and the other goes quiet in a way that is more like agreement.

One thing this contact can give is words that seem to know the person they are for. It can also carry a few things along with it.

Because the words and the person are so near, a passing remark may be heard as a definition. A light comment on how the Sun person is can sound like a statement of what they are, and the person who made it may not know it has been kept.

A good phrase can stick. A label offered for someone's way of being may become the way both of you think of it, even while the person is changing.

And because so little needs explaining, a question may sometimes go unasked that either of you would have been glad to be asked.

That is one way the contact can run: accurate, memorable, and sometimes quicker to settle on a description than either of you meant.

Two passages in the older sources used here name the Sun with Mercury in an aspect: William Lilly's (*Christian Astrology*, 1647, Book III, p. 638) and James Wilson's (*A Complete Dictionary of Astrology*, 1819, p. 381). Neither passage says anything about the conjunction. The only aspect either names is the opposition. Lilly's page also has a line on the Sun and Mercury standing in each other's places, which is not an aspect and is not used here. So nothing from the older sources is used for this contact.

The conjunction reading on this page, that a Sun and a Mercury close together read as fusion or mirroring because they usually share a sign, an element and a way of moving, is an editorial reading, not something the older books say about the Sun and Mercury. The same goes for everything else on this page: who the Sun person and the Mercury person are, what each gives and may want, the element variations and the sketches, which are illustrations. Lilly and Wilson are quoted on the page for Sun opposition Mercury.

• One of you can say what the other is like in a way the other recognises at once.
• A remark from one of you has been remembered by the other longer than you expected.
• One of you finds that you say more, and more directly, in this person's company than in others.
• You sometimes use the same phrase for the same thing without having agreed to.
• Now and then a description one of you offered has been repeated back so many times that neither of you is sure whose it was.