Question

the orbit of a planet is an ellipse with the sun at one of the foci.?.​

Answer 1

The orbit of a planet around the Sun (or of a satellite around a planet) is not a perfect circle. It is an ellipse—a “flattened” circle. The Sun (or the center of the planet) occupies one focus of the ellipse. A focus is one of the two internal points that help determine the shape of an ellipse. The distance from one focus to any point on the ellipse and then back to the second focus is always the same.

Answer 2

Hey here is your answer.....

The orbit of a planet is an ellipse with the sun at one of the foci. A line segment joining the planet and the sun sweep out equal areas with equal intervals of time.

Hope it helps to you....