Consider a cosmic sail-boat moving under the influence of the pressure of sun-light…..?

Consider a cosmic sail-boat moving under the influence of the pressure of sun-light at a distance from the Sun similar to that of Earth. What kind of accelerations you can expect? How do those light-pressure forces compare with the gravitational pull of the Sun?

Both gravitational forces and the light pressure decrease as inverse squared distance from the Sun, and therefore the answer is independent of the distance. Since gravitational force is proportional to the mass of the sail, while the light pressure is proportional to the area, by equating these two we can find the maximal allowed thickness of the sail. Unfortunately, it comes out to be smaller than a micron. So much for solar sailing.

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