Hi
I use the astrology software called ARGUS from Electric Ephemeris. In this programme the user can set the speed of the primary directions to "Kündig Sun key", which means that the primary MC moves ahead with the same speed as the Sun did on the person's birthday.
For rectification I use the method developed and described by the Swiss astrologer Heinrich Kündig. There is a link to his birth chart here, in case you are interested:
https://www.astro.com/astro-databank/K% ... ,_Heinrich
According to Kündig, the birth chart can only start on one of the times given in a table calculated with the Kündig rectification method. It's just like a time table for a train, a bus or a flight: The bus / train / aeroplane will not leave at any moment, the passengers have to wait for the scheduled moment - only it is the opposite way with a birth chart: If I am born between two scheduled times, the chart starts on the nearest
previous time in the Kündig table.
When I rectify a chart, I make ARGUS calculate the Kündig table +/- 2 hours from the given time. Then I test each moment with dates and places for major events, e.g. death, birth of children, birth of parents, career events - or whatever, as long as the event was of importance. It's a process similar to forwarding or rewinding a movie. I use transits and progressions only and the orbis has to be very small - maximim 26' or - if triggered by other aspects - 1 degree. Only aspects involving axes count.
Once I have found the expected aspect pattern for all the items in the list of major events. it means that I have also found the exact birth moment - or rather: The moment, when the birth chart started - which is the moment that counts.
I have literally rectified thousands of celebrity charts using this method. I store the names in an Excel sheet with categories for each chart, e.g. profession, life span, health category, etc. Furthermore I have made statistics with the categories for these charts, thereby enabling me to recognize members of each category.
As for my clients, they are very satisified with the prognoses I make based on the rectified charts, because the prognoses are very accurate.