Synastry is a form of astrology that focuses on compatibility between two or more persons in relationship. This is a highly useful tool for assessing marital, romantic, parent/child, and business partner combinations.  

In addition, there is a third chart known as the “composite’ chart, which basically describes the two people as functioning as one unit.  

The horoscope can also glean the ideal purpose for the relationship which may or may not correspond to the one intended. Moreover, astrological patterns can also suggest whether the relationship is likely to be of very limited or long duration, areas of harmony and areas of potential conflict.