* Ancient Origins: Constellations were not "discovered" in a single moment. Ancient civilizations across the globe recognized patterns in the stars and named them based on their own myths and stories. Leo, representing the lion, is one of the oldest recognized constellations, appearing in Babylonian, Egyptian, and Greek astronomy.
* No Single "Discoverer": Early astronomers weren't focused on scientific discovery in the way we understand it today. They used constellations for navigation, timekeeping, and storytelling. The process of recognizing Leo as a constellation was likely gradual, evolving over centuries.
Instead of a single year, we can say that Leo has been known for thousands of years. It's a testament to the enduring power of human fascination with the night sky.