PICTURE THIS: You are in space directly above the north pole of the sun. Our sun. You are far enough out in space to see all the planets revolving around the sun.
Now you look at your watch and you see that it is your birthday. The actual day and time of your birth. Now you take another look at the planets. Remarkably, this looks very much like the pattern on your Astronology Talisman.
Your Birth Talisman is actually a miniature representation of the pattern the planets formed when you where born.