What is a Davison relationship chart?
The Davison relationship chart [DRC] was named for Ronald C. Davison (1914-1985), author and president of the Astrological Lodge of the Theosophical Society of London. 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.
Even if the combined place of birth is located in the middle of the
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.
Having understood what a Davison relationship chart is, here we will look at the Iran-US relationship . Shown above is the DRC for
Iran [1 Feb 79; 9:00
am IT, Tehran] and the US Sibly [4 Jul 1776; 17:14
The following points come to attention immediately. Philadelphia
The upcoming lunar eclipse [25ar] falls opposite the composite Sun [25li18]. The eclipse is conjunct the star Acamar, theta Eridani often shown as a dam in the river of life. Since eclipses are known to end old chapters and begin new ones, it appears appropriate that this eclipse is hinting at the need for an end to the stalemate in the US-Iran relationship. The Sabian symbol for the composite Sun “An Eagle and white Dove quickly change into each other” says it all.
The directed solar arc Sun [13pi] is forming a conjunction to Moon [13pi] and Saturn [14pi]. All these are conjunct the stars Achernar [14pi] and
Rosenberg writing about these stars says: Phoenix
Endings and new beginnings…pushing boundaries, solving problems and altering mankind’s view of the world, freeing humankind from outdated illusions and outmoded conventions of thought…the ever-regenerating Phoenix offers renewal and healing….history and paradigm altering events; peace treaties.
The radix Sun [25li18] is in a sharp quincunx aspect to Pluto [25ta04] which is conjunct the star Algol [24ta28]. The star Algol [26ta22] that has been historically prominent in atomic explosions 
Finally, the lunar eclipse chart at the midpoint between
completes the picture. In a strange coincidence the eclipse occurs on 18
October, which is the composite radix
date [18 Oct 1877]. Then we notice that the eclipse is placed prominently
square the horizon axis with the Ascendant
conjunct Jupiter [19cn] which itself is conjunct Castor, alpha Gemini
part of the Indian lunar mansion Punarvasu
[“The two who are reunited or good again”]. This mansion is also called the “the
star of renewal” and “the return of the light”. Washington