Answer:
direction of gravitational pull of the Sun on the planet
Explanation:
A planet orbiting or revolving around the sun due to gravitational force of the Sun on the planet which attracts the planet and compel the planets to move in a circular path. If this force of gravity is not applied on the planets, the planets will move in a straight line instead of circular direction so gravitational pull of the Sun on the planet is very necessary for moving planets in a circular path.
Answer: Here is a picture of the answere for a better perspective.
