[Size of Mercury increases gravity during orbital motion]
Mm/r^2 is formula for gravity. There are models for Mercury and Sun. When, 2Mm is 100 and r is 50, gravity is 0.04. Next, two half spheres of Mercury are lined up on the line of action of Sun's gravity. Mm is 50, r is 49 and 51. Then, gravity is 0.0400479.
[Size of Mercury increases centrifugal force during orbital motion]
See my post posted on March 15, 2023 (or around).