The sun represents our vitality and our conscious ego, the self and its expression. It establishes our will to live and our creative force. It is associated with spontaneity and health. A well aspected Sun will describe a person who has heart, who cares for others both in general, and at the personal level. A poorly aspected Sun will describe a person who either has much more difficulty accessing this love and caring ability. In your chart the position of the sign represents your life purpose and style in which your make your mark in the world.
Sun Square Midheaven
You have a great deal of self-assertive energy, and you will want to get ahead in life, to be well known and highly regarded by others. But in order to get where you want to go, you must learn to make some compromises. Your relationships may be difficult, especially early in life, because others may sense that you are interested only in yourself, which puts them off and keeps them from wanting to help you. Elders may resent your know-it-all attitude, for they feel you aren't old enough to know much of anything. While you are young you may have a lot of conflicts with authority figures, but eventually you will learn how important they can be to you. Another possibility is that you will attract people who are very dominant, who will not let you do what you wish. A friend like that is more of a rival than a real friend. But you can gain something by testing yourself against such people. You can gain a greater understanding of your strengths and limitations, which will make you more effective on the other hand, domineering people can be a real barrier to your getting ahead. In any case, the main thing is to understand yourself and the kind of effect you have on other people. Then you will always know what you are doing and how you influence the course of events through your own energies. Sometimes this aspect signifies conflicts with your father. However, even though you may resent him now, he is the most important person in your development.