The sun is not located on a diagram of Earth's orbit. It's the center of the orbit.

Here's why:

* Earth orbits the sun: Earth revolves around the sun in an elliptical path.

* The sun is the focal point: The sun is one of the focal points of this ellipse.

* Diagram representation: In a diagram of Earth's orbit, the sun would be placed at the center or slightly off-center to represent the elliptical shape.

Let me know if you have any other questions!