To create your free synastry chart enter two names, places of birth (or nearest city), and dates of birth below. Entering a birth time is optional, but including it will provide a more accurate birth chart. When a time isn't provided, the time defaults to noon.
Think of a map of the cosmos that is a snapshot of the exact planetary coordinates of when you were born. Now when we overlay another individuals map over your map, we can visually see where their planets were located in relations to yours - that is the basis of a synastry chart. Basically it is overlaying two individual’s birth charts and examining the aspects between the two charts.
Visually a synastry chart looks exactly like a birth chart - a 360 degree wheel divided into 12 sections. The only difference being that there are twice as many elements being charted. In a synastry chart, an aspect is the geometric relationship between the two sets of planets. An example of an aspect shape includes a square, trine, conjunction, and more. Each aspect shape produces a different meaning.
Synastry charts and composite charts are similar in that they both explore relationships. Synastry charts are used to examine relationships between two people, more specifically, how they may effect one another individually. From that an astrologer can use the chart to interpret the character and dynamic of the relationship.