Kepler
has this capability of assisting you in rectifying a chart.
To rectify the chart, you enter major events in the person's
life and the predictive methods on the right. Shown on the
right are the screens for selecting the forecast methods desired
and for adding events.
Important
dates such as marriage, birth of children, accidents, relocating,
etc. only are used to rectify the chart. As you can see on
the screens shown on the right, you can check various predictive
methods, such as transit-to-natal, Day-for-a-Year progressed-to-natal,
Day-for-a-Year progressed-to-progressed, etc. Different astrologers
prefer different methods.Kepler produces a total score for
how well the dates could have been predicted based on the birth
time. Then
you can adjust the birth time and produce a new set of scores.
You can also change the astrological weighting for each transiting
or progressed aspect if you have your own theories about what
astrological factors are likely to result in particular kinds
of events.