Discovery of Earth:
The discovery of Earth cannot be attributed to a single individual as humans have always been aware of their surroundings and the planet they live on. However, the understanding and exploration of Earth have evolved over time.

Ancient Times:
In ancient times, people believed that the Earth was flat and was the center of the universe. Greek philosopher Pythagoras was one of the first people to suggest that the Earth was a sphere around 500 BC. Later, Greek astronomer Ptolemy created a model of the solar system with Earth at the center.

Scientific Revolution:
The scientific revolution of the 16th and 17th centuries saw many discoveries and advancements in the understanding of Earth. Nicolaus Copernicus proposed the heliocentric model of the solar system, where the Sun was at the center and the planets orbited around it. Galileo Galilei used his telescope to observe the planets and discovered that the Moon had craters and mountains, challenging the belief that celestial bodies were perfect spheres.

Modern Age:
In the modern age, space exploration has allowed us to see Earth from a different perspective. In 1961, Yuri Gagarin became the first human to orbit Earth, followed by many more space missions. The Apollo missions allowed humans to land on the Moon and observe Earth from its surface. Today, we have satellites orbiting Earth that allow us to monitor the planet's weather, climate, and resources.

In conclusion:
While the discovery of Earth cannot be attributed to a single person, the understanding and exploration of our planet have evolved over time. From ancient beliefs of a flat Earth to modern-day space exploration, humans have gained a deeper understanding of our planet and its place in the universe.

Early Greek philosophers alluded to a spherical Earth, though with some ambiguity. Pythagoras (6th century BC) was among those said to have originated the idea, but this might reflect the ancient Greek practice of ascribing every discovery to one or another of their ancient wise men.