Comparative Chart for Surgery
Rectification is concerned with trying to find a birth time that enables accurate predictions to be made.
There are several ways of rectification but the main approach is to identify significant events in a person's life, look to see whether these are reflected by transits and/or progressions and if not, whether there is a pattern of error - e.g. the events seem to occur about one year later than the forecast suggests. Adjust the birth time so that the events occur in line with predictions.
The rectified chart can then be used with any future predictions with greater confidence. There is no way of proving that the birth actually took place at the rectified time, but as long as it provides more accurate predictions that is all that mattters.
Since this is the only general rectification thread I could find, I decided to post this here. I'm (finally) working on rectifying my father's natal chart. He's 87 and has twice had stent surgery for an aortal aneurism, so I'm looking for some indication of when his next "event" might be. We have no idea of his actual birth time. So far I've only done a little with major life events, as I'm focusing first on a reasonable "profile" of angles and planetary placements.
He has a very placid demeanor and calm, gentle temperament, so I postulated a negative sign on the Ascendant to go with his Cancer sun. I started with Pisces since it would place all of my late mother's Virgo emphasis in his 7th (Placidus) house. Nothing else clicked so I tried Virgo ascending. Since my mother was a very strong matriarchal figure who molded him and often spoke for him, her Sun in his 1st house seemed plausible. Nothing else fit, though. Then my wife suggested that he could possibly be a double Cancer. Since he is clearly not a 1st house Sun type, and emphatically not angular, I erected a chart with a late degree of Cancer rising that pushes his Sun back into the 12th house, beyond the 5 degree band. This created a number of interesting "broad-brush" scenarios.
This places his Moon-Jupiter-Part of Fortune conjunction in the middle of the 5th house, supporting the idea of MANY children (he had nine); it places Saturn in the 4th house, and my earliest memory of him is that he was never home; the fact that he was a long-haul truck driver seems to be consistent with this and with Sagittarius on the 6th (travel-as-work); Mars in Pisces went into the 8th, and my mother died when transiting Uranus was in the 8th and opposed natal Neptune, symbolically liberating him from his 10-year-long caregiver role (she was a diabetic amputee with congestive heart failure); Uranus in Pisces in the 9th reflects his long-time fascination with a certain "cult" religion (albeit a wealthy one), and the close trine to his 12th house Sun shows just how readily he identifies himself with it (or, more accurately, surrenders himself to it); Mercury in Cancer is void-of-course in the 1st, and he has always been ripe for thought-control by a dominant partner (his second wife is a mirror-image of the first in that regard); Aries is on the MC - he was always a very energetic and enterprising - although not entrepreneurial - career man with a strong union affiliation, and he worked two physically demanding jobs for much of his life; and finally, the 12th house Sun seems to fit well with the fact that he is perfectly content staying in the background as long as he has a forceful partner to "pour himself into."
I ran the prenatal New Moon calculation and came up with a natal Ascendant that is less than 5 degrees different from the one I had projected. Since it pushed the Sun almost onto the angle, I decided to stay with my original 12th house Sun chart. That amount of discrepancy seems well within a reasonable margin of error for the time of conception. Next I ran the secondary progressions for the planets and the solar-arc direction for the MC. This places the progressed Moon in Aquarius, moving through the 8th house and the progressed Sun in Libra in the 4th house. He will have the first (direct) hit of a belated 4th-house Saturn return (his third one!) on November 11, the retrograde hit in April of next year, and the final direct hit in August 2012. This also places the progressed MC in close conjunction to his natal 12th house Venus in Cancer.
That's as far as I got to date. I still need to get a better grip on transits for the period of his two surgeries, for my mother's death, and for his second marriage. And I still need to run down all the transiting and progressed aspects. But all of this shows preliminary promise from an "anecdotal evidence" perspective. On his website, Chris Brennan has "5 Tips for Natal Chart Rectification" that I may take a look at as well. As many people have commented, rectification is primarily a "visual art," and isn't something you can successfully program into a computer.
Any thoughts from anyone?
Edit: On further investigation, I found that, at the time of my mother's death, transiting Saturn was making a partile T-square (apex Saturn) to my father's (rectified) natal 2nd-8th house nodal axis from his 11th house. Ebertin says of negative Saturn/Node contacts: "Inhibitions or difficulties in associations or partnerships, terminations of blood-relationships, the death of relatives or kindred."
Edit #2: I generated an event chart for the time of his second marriage; lots of contacts to the radical chart there: Sun (t) angular, conjunct natal MC w/in 1 degree and square Venus (r); Moon (t) trine Venus (r); Venus (t) square Ascendant & Mercury (r); Mars (t) sextile Sun (r); Jupiter (t) conjunct Venus & PF (r); Jupiter & PF (t) trine Mars (r); Jupiter (t) square MC (r); Saturn (t) sextile MC (r); Saturn (t) opposition Moon & Jupiter (r).
All of the transiting planets except the Moon were above the horizon of his natal chart. The Moon position in the 4th house showed that he finally found another "mother" after being a lost soul for the year after my mother died. There are as many hard aspects as soft ones in this comparison, showing that this was an extremely stressful time for him emotionally.
Edit #3: I erected an event chart for the date and time of his second surgery. All by itself, the chart is revealing. Saturn in Libra (exalted) was angular, conjunct the MC within a couple of degrees and the North Node, also angular, was conjunct the Ascendant within the same orb, apparently showing that he gave himself over into the hands of the surgeons at that time. Sun, Venus and Mercury were conjunct in the 8th house of surgery, in Leo which rules the aorta (the subject of the surgery); Venus was within 1 minute of exact (Cazimi) and Mercury was retrograde and within just over 1 degree of exact (combust).
When compared to the natal chart, transiting Sun, Mercury and Venus were conjunct the MNN (r) within a few minutes of arc, in the 2nd house; Moon (t) was trine the Ascendant (r); Mars (t) was square the MC (r) and conjunct Pluto (r); Saturn (t) was square Pluto (r) and widely (5 degrees) opposed the natal MC, making a slightly loose T-square with Mars-Pluto at the apex (Ebertin says “a fateful struggle”); Uranus was widely (4 degrees) conjunct the MC (r). Before he had the surgery, I cast an astro-geomancy chart that showed he would come through the surgery well, both in the short term and the long term. In retrospect, I don't see much in this event chart that would have changed my mind. The two-hour surgery did drag on for over 6 hours, though, which may have been related to the retrograde and combust Mercury and the opposition of Saturn to the natal MC.