Hans Ertel was a person who lived a long time ago and was interested in the stars and the planets. He wanted to understand how they moved and how they affected our lives on Earth. Hans Ertel figured out that the position of the planets and stars at the time we were born can give us information about our personality and life's path. This is called astrology. While some people believe in astrology, others do not because there is no scientific proof that it is true. But Hans Ertel's work and ideas are still talked about and studied by many people who enjoy learning about the stars and how they relate to our lives.