When the Sun in one chart forms an aspect to another person’s Mercury.
Sun conjunct Mercury in synastry:
Talking and sharing ideas is highlighted in your relationship. You enjoy learning new things together and exchanging points of view. You work well together in planning, organizing, theorizing, writing, or communicating ideas in any manner. You work together effectively on daily chores, problems, or business activities. One of the first things you might notice when you meet is the ease with which you talk with each other–you are rarely short on something to say. You stimulate one another to think and express yourselves more clearly and creatively. The mental rapport between you may not be the most dramatic of romantic connections, but it helps you connect with ease, and it ensures that you will be able to sort through many problems by drawing upon rationality and logic.
Sun opposition Mercury in synastry:
Lively exchanges of ideas are common between the two of you. Fortunately, you understand each other well, but you certainly can have different opinions, sometimes opposite opinions and perspectives on any given intellectual issue. Despite your differences, you work together very well in practical matters, planning, organizing, developing or communicating ideas, and your differing viewpoints are not likely to be a serious problem. In fact, they can only serve to spark some of the most interesting conversations around. Sometimes Sun finds Mercury a little too analytical or detached when it comes to opinions, and Sun gets fired up and appears to Mercury to be overly personal about issues.
Sun square Mercury in synastry:
The two of you do not always see eye-to-eye on issues, and it is very easy for Mercury to become critical of Sun’s plans or course of action. Compounding the problem is Sun’s tendency to be very sensitive to criticism from Mercury and consequently react defensively to this criticism. Sun may find Mercury to be “all talk and no action”, and Mercury may become frustrated, believing that Sun doesn’t “get” the spirit behind Mercury’s words. This need not be a serious problem however; a little tolerance for each other’s right to disagree and respect for individual differences is all it takes to make personal differences stimulating rather than annoying. You challenge each other to see things from a different perspective.
Sun trine Mercury in synastry:
This active, mental aspect between your charts suggests a positive flow of communication and activity between you. You love to chat with each other, and, most of the time, you understand what your partner means. Many communication problems in relationships stem from misunderstandings, and this aspect helps you to “get” what each other means, at least in an overall sense. In particular, Mercury very easily finishes Sun’s sentences, because Mercury understands Sun’s intentions. Sun admires Mercury’s intelligence, and appreciates this understanding. This is a real friendship aspect. On its own, it doesn’t have romantic overtones, but any romance will benefit from this stimulating and expressive energy. Mental rapport makes for stimulating conversations and ensures that there are many moments in your relationship when each of you feels supported by your partner. This is a problem-solving aspect. When the two of you put your minds together, you come up with positive solutions to problems.
Sun sextile Mercury in synastry:
You stimulate in each other the desire to communicate. You encourage each other to talk about anything and everything, and rarely, if ever, do you make each other feel uncomfortable about chattering! Idle chit-chat is part of your relationship, and although chit-chat may not be high on the list of relationship priorities, this easy flow of communication can be immensely satisfying. This is because underlying this easy flow is the idea that you can be yourselves with each other, and that you can easily relax in each other’s company. The mental rapport that you two share is a big reason why you enjoy each other’s company and are good friends. Communication is open and, overall, quite harmonious. You are able to work together very effectively on practical affairs, daily chores, problem-solving, and business activities.