A composite chart is like the baby of a relationship between two people. The composite chart is a calculation of the two energies of two people combined. Whereas a synastry chart is one individual’s chart in comparison and connection to the other individual’s chart. I Use both methods when doing these relationship readings. Composite/synastry readings are usually conducted for two people in a relationship with each other, ie intimate partners, mother/child, father/child, siblings or friends. etc.