Davison Relationship Chart

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The Lovers (Rider-Waite Tarot deck.)

A horoscope calculated by combining the birth data of two or more individuals, versus a composite chart calculated by determining the midpoints between planetary pairs in two or more horoscopes. The Davison relationship chart was named for Ronald C. Davison (1914-1985), author and president of the Astrological Lodge of the Theosophical Society of London.[1] Both Davison relationship charts (DRC) and composite horoscopes can help to assess the main themes within a relationship.


The date and time can be determined by calculating the day that lies exactly between the natal charts of those involved. The same principle is also applied to the times of birth.

If the individuals involved have different places of birth a combined "place of birth" is calculated by taking the average values of latitude and longitude.

The calculations for erecting a DRC for more than two people is a more complicated procedure, usually relying on a computer program.


Even if the combined place of birth is located in the middle of the Pacific Ocean, the DRC is still a concrete horoscope for a specific time, place, and location which can, like any natal chart, be used as a basis to calculate solar return charts, progressions and the effect of transits. According to Mona Riegger it "can help to reveal the main theme which brought two people together, the kinds of experiences they will have, and which areas of life will be most affected."[2] She argues that the DRC can unlock the door to the deeper mysteries of a relationship in a way that other methods such as synastry are not able to do.

The Davison relationship horoscope is considered using the usual criteria for interpretation. The DRC initially describes the partnership as a whole. But it can also reveal aspects of the individuals involved when the ascendant is taken as representing the older partner; and the descendant the younger one, which is at the same time his or her ascendant. In the same way the Medium Coeli and Imum Coeli are reversed, with the MC of the older partner representing the IC of the younger one.

See also


  1. Ronald C. Davison, Synastry, Understanding Human Relations Through Astrology, 333 pages. ASI Publishers, U.S. 1977; 1978; 1980 ISBN 978-0882310169; Aurora Press Revised edition 1983; 1986; 1991 ISBN 978-0943358055
  2. Mona Riegger, 1998, Handbuch der Combin- und Compositdeutung, Chiron Verlag, p. 34 (German).