However, here are some related concepts:
* Solar Axis: This is the imaginary line passing through the North and South poles of the Sun. It's important for understanding the Sun's rotation.
* Equator: This is an imaginary circle around the Sun that is equidistant from the North and South poles.
* Diameter: This is the distance across the Sun through its center.
* Radius: This is the distance from the center of the Sun to its surface.
If you're looking for a specific line within the Sun for a particular purpose, you can describe it using those terms. For example, you could say "a line through the center of the Sun along its equator" or "a line through the center of the Sun perpendicular to its surface".
