posted April 13, 2006 03:30 PM              

For example, for a couple that they do not have venus/mar aspect in composite or synastry chart. However, they have venus conjunct mar in Davidson chart. Can we interpret the aspect the same way we interpret the composite chart calculated by midpoint method?

posted April 14, 2006 03:20 AM              

There's little info about it on the net...

I found this:

Quoted:
"Compatibility & Conflict: The Davison Relationship Chart is different from the Composite Chart, the Davison Relationship chart is what I call "The Birthday of the Relationship." This chart has a real date, time and place and is unique (of course) to the combined chemistry of the two individuals involved. You will learn the fine points of working with this amazing indicator for the nature and purpose of any relationship."
www.isarastrology.com

posted April 14, 2006 04:47 AM            

Since the Composite Chart shows a symbolic constellation, rather than a real one, many prognostic techniques (transits, Solar returns, directions) cannot be applied, or only with reserve. As a complement to the Composite Chart, which is based on a physical mid-point, the Davison Relationship Chart was developed. The Davison Chart is computed for a mid-point in time, in relation to a geographical mid-point or 'middle point' and drawn like a birth chart. The interpretation is similar to that of a Composite Chart. The outer planets and the Meridian are usually similarly positioned in both chart types, since any time taken as a mean between both birth times will show these to be more or less in the middle between both positions. The important difference is that the Davison Relationship Chart is based on a real point in time, thus enabling one to use all the known techniques such as Solar returns, transits, progressions and other directions in order to explore a development in time.

http://www.astro.com/faq/fq_fh_round_e.htm

What is the difference between the "corrected" and "uncorrected" Davison Relationship Chart?

The Medium Coeli (MC) computed for the time midpoint, which is the basis of the Davison chart, deviates very slightly (usually by less than 1 degree) from the composite MC (computed as the midpoint between the two personal MCs). The time correction applied to the standard Davison chart brings its MC into perfect alignment with the meridian axis of the composite chart. Most astrologers read the composite chart and the Davison chart together.

http://www.cafeastrology.com/compositechart.html

Progressed Composite Chart
The composite chart, unlike the Davison Relationship Chart, is derived by taking the mathematical midpoint between each person's planets and points. The Davison Time-Space Relationship chart is similar to the composite chart, except that it is drawn for the date, place, and time that is exactly midway between the individuals' birth times and places. Composite charts and Davison Relationship charts often look similar. However, Davison charts have "time and space" reality—these charts are drawn for real points in time and space, and include phenomena (such as retrogrades and eclipses) that composite charts do not.

So, while we can progress the Davison Relationship chart using traditional techniques, if we want to study the progressed composite chart, we first progress the natal charts of the individuals to a specific date, and then make a composite of those progressed charts.

http://www.cafeastrology.com/synastry_books_compared.html

Relationship Analysis (Astrology A Language of Life Volume IV) by Robert P. Blaschke

Note that the author finds both the composite chart and the Davison relationship chart important. The Davison Time-Space Relationship chart is similar to the composite chart, except that it is drawn for the date, place, and time that is exactly midway between the individuals' birth times and places. Composite charts and Davison Relationship charts often look similar. However, composite charts are derived by taking the mathematical midpoint between each person's planets and points. Davison charts, on the other hand, have "time and space" reality--these charts are drawn for real points in time and space, and include phenomena (such as retrogrades and eclipses) that composite charts do not.

http://www.panix.com/~gsk/LovePart2.html