This method can be referred to as either Western numerology or Pythagorean numerology. Pythagoras, the Greek mathematician and philosopher who lived from 569 to 470 BC, is known as the father of Western numerology. Pythagoras began his theory of numbers by discovering the numerical relationship between numbers and musical notes. He found that the vibrations in stringed instruments could be mathematically explained. The Pythagorean method uses an individual's name and date of birth. The name number reveals the individual's outer nature. This is the personality that they present to the outside world. To start, you need to use the individual's full name as written on their birth certificate. Then, each letter is assigned to a number one to nine, based on the ancient Pythagorean system. The numbers are assigned to letters of the Latin alphabet as follows: