Where does your Sun fall in another person's chart? When you overlay your Sun onto the chart of your partner, you can gain plenty of insight into how you affect that person, and what areas of their life you take particular interest in.

Looking at the planets and their aspects – planets in relation to each other – and the interaction between the two birth charts, we can learn much about how two people in a relationship interact and what kind of impact they have on one another. They also describe the areas of life in which this interaction is concentrated, and how each person views the other person in more specific terms.

 

As well as looking at this synastry, there is the composite chart, which is derived by determining the mathematical midpoints between each person's planets and points, to create an entirely new chart altogether—the chart of a relationship.

Basic relationship dynamics can be seen in the composite chart and, as relationships are not static, their development with time can be indicated by this chart and give a better understanding of the evolvement of the relationship.