What happens if you don’t even know your birth date?

Then really, don’t go to an astrologer unless you’re ready to go a lengthy process called Birth Rectification. That might take hours if not weeks plus a lot of interaction with you to confirm your most likely chart. What the diligent astrologer (difficult to find them for free) would have to do is to keep on fine-tuning some of your horoscopic positions. He would probably start by placing your ascendant somewhere he thinks relevant, and with that, he’d try to read the chart as a whole and see if it fits with your life events. If it doesn’t, or he thinks it’s not conclusive enough, he’d continue adjusting the chart with other “what if” positions. This part of the work is so specialized that some astrologers offer this service only to other professional astrologers who need this work done for their very important clients.

There is one other way whereby you don’t need to give your birth particulars, and that would be when you use the services of a “horary” astrologer. Obviously, this is a professional astrologer who is adept at using a special branch of astrology called Horary Astrology. That’s where you ask a very specific question, and you get a very specific answer to that question on the spot. But that horoscope cannot be used for anything else. But even these professional astrologers report that their horary techniques are used best when used in conjunction with a reliable birth chart.