Synastry is the name given to the technique of chart comparison. You put one chart alongside another and compare how the charts interact, what interaspects the planets and angles make to each other and how they fall into each other’s house system. Examining the meaning behind each individual relationship of chart elements and their blended meanings gives the basis for understanding how these two individuals will interact and their impact on each other. But this is not the first step in synastry.
The first step is in analyzing each individual chart as a stand-alone whole. The first step is in assessing each individual’s capacity for relationship. Each person has strengths and challenges in regard to individual functioning. Each has a distinct personality with distinct needs, tastes and goals. It is important to truly get a handle on what those needs and challenges are before you move on to comparing how they relate to this specific other; you need to find how they relate to themselves, the world and the other in general.
Who you are as an ego is the Sun. The emotional body and needs are the Moon. Venus holds the key to the personal aesthetic. Mercury is representative of how one communicates. Mars expresses in the way a person acts. The condition of these planets and how they interact with other chart elements tells of a persons capacity for relationship. Placements in the 7th house are particularly key for they relay the ways in which one is other-oriented. The ruler of the 7th house and its placement is also telling. It is helpful to note each person’s areas of ease as this is often where they have a wealth to share. The difficulties in the chart should also be taken into account as these are often exacerbated by contact with the other’s chart, for good (growth) or ill (stagnation or backsliding).
Overall trends in a chart affect the general nature of the person and that will affect how they are in relationships in general, their capacity for relationship, not just in regard to one particular person. This first step is very important before you even bring another into the equation. It’s like knowing how to multiply before you learn to divide.
How well do you know your own chart? What is your own judgement on your capacity for relationship in general?