Hello,
Are you talking about reversed progressions?
I have seen them mentioned in lots of articles as being active when significant events occur, e.g. cafeastrology mentions it as something that shows when a person gets married.
I tried to do them on astro.com, but they don't have the option of reverse progressions in their drop down menu on the extended chart selection page, so what I had to do was draw up a natal chart for the number of days before my birthday equivalent to my age (1 day = 1 year). This is not as accurate as the progressed chart, but it gives an idea of what will happen sometime during that year. I've only done them for the future, so haven't yet seen if they work, but they do seem to correlate - for example in 2 years I have venus conjunct natal mc by reverse progressions, and at the same time progressed venus sextile natal sun and solar arc venus conjunct natal ascendant - I'm hoping for good things
Generally, there are tertiary progressions and secondary progressions. Secondary progressions are the ones I use, where you take 1 day = 1 year after your date of birth, and they show quite accurately significant events in a person's life. There is the option to calculate these on astro.com extended chart selection & you can read more about them on skyscript and astrowiki.