You didn’t give an answer. How could you have? You never addressed the question. The question relates to the deviation of the earths orbit from a circle, as characterized by its eccentricity. You never got anywhere near this.
You provided a formula for the width of a 0.5mm pencil line forming an 8” circle scaled up to the size of earth’s orbit. You considered no information about the shape of this orbit.
“Trust me, I know what I’m doing.”
I was a physics TA! ... back in the day.
Physics TA... is a circle an ellipse?
Cooks know the answer to that question.