Here's why:
* Earth's orbit is elliptical: It's not a perfect circle, but slightly oval-shaped.
* Kepler's Laws: Johannes Kepler's laws of planetary motion explain that planets move faster when they are closer to the sun.
* Perihelion and Aphelion: The point in Earth's orbit where it's closest to the sun is called perihelion, and the point where it's farthest is called aphelion.
So, perihelion is where Earth reaches its maximum orbital speed.
