Predictions at times fail because the exact time of birth is not known or it is known only apporximately. The moment when the umbilici cord is cut is generally not noted. Hence one has to rectify the given time of birth. There are some methods given by the ancient texts. Some methods refer to the Moon and Mandi. 'Uttara Kalamrita' offers a method based on the birth constellation and the weekday. Modifications to this are made by recent writers. These provide a stable background from which one can proceed. Finally symbolic directions are explained in detail. With the help of the important events in the past, the symbolics, it is maintained, will help us rectify the time of birth with in a minute or two.