A necessary element in determining astrological compatibility is the erection of a composite chart. This is a chart in which the two (or more) charts are blended, averaged out, to create a single wheel.

Through studying the composite chart of a relationship, we can gain important insights into the dynamics of a couple. The composite chart is the chart of the relationship itself.

The Davison horoscope (sometimes called the Relationship horoscope) is set up for the midpoint between two birth dates, times, and places. The birth date midpoint is difficult to calculate by hand because a year isn’t even. It has 365 1/4 days.