Polaris is a rectification software developed by Isaac Starkman, using the methods of the late astrologer and researcher Alexander Marr. It seeks to use a logarithmic equation to weigh potential birth times as being more or less likely based on a point scale, using supplied events of importance from the subject’s life.
Some astrologers believe rectification to be an important process in giving clients a proper astrological reading. The belief is that many people are unsure of the exact time of birth and therefor their chart will be skewed by insufficient or improper data. Rectification seeks to correct this error by calculating a probable “real” birth time by weighing the probability of past known events against a list of possible birth times using astrological methods.
Rectification, in relation to Polaris, is a process where a person’s birth time is calculated (rectified) by a computer program with the aid of additional important dates in that person’s life. The subject need only give their birth date, hopefully a rough idea of the time of birth, and as many dates of importance from their life as possible and the program goes to work calculating the “real” birth time, even to the second.
If you want to find out the time of birth you can ask all the question about the significant events in one’s life and use your intuition and astrological experiences like Hieronimuss is doing here, but I still recommend to support your findings with this great reference book: The Complete Book of Chart Rectification by Carol A. Tebbs.