Earth-Sun distance

The Earth-Sun distance, often referred to as an astronomical unit (AU), averages about 93 million miles (150 million kilometers). This distance is crucial as it defines Earth's orbit around the Sun and affects our climate and seasons. The Earth's orbit is slightly elliptical, so this distance can vary a bit throughout the year. The concept of the AU is important in astronomy, as it helps scientists describe distances within our solar system more easily, allowing for comparisons between different celestial bodies and their orbits.