| Composite and Coalescent charts Davison Relationship Charts |
| Another synastry chart method included in Win*Star is the Davison relationship chart, first developed by Ronald Davison of Great Britain. There are two ways to calculate the relationship chart; the differences are usually slight: | |||
| ...the Davison "Exact-Midpoint" version: ...and
the Spherical Earth Midpoint |
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| The first method calculates the midpoint in time
and space between the two charts, that is the exact halfway point in time, latitude and
longitude. The second method (we call it a Relationship chart) does the same, but uses a
spherical Earth midpoint in determining the location. This may vary a bit from the first
method when working with charts of individuals born very far from one another. Although Composite and Davison charts often give similar results, an important difference is that a Davison chart is a "real" chart, that is to say it represents a real moment and location. For this reason it can be progressed or directed as with any natal chart. The Composite, though, is an abstraction, a chart for a set of midpoints that may never have existed in real time and space. The way to progress or direct one, then, is to progress or direct the two natal charts, then create a Composite progressed or directed chart from them. The Ascendants of the Davison and Relationship charts vary by only a little more than one degree.
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