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Old September 14 2012, 07:04 AM   #2
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Location: Virginia USA
Re: About planetary gravity

There would be a minor weight decrease and change of net angle at low latitudes due to a planet's rotation, which would be in inverse proportion to the rotational period. Those forces would also tend to make the planet bulge a little around its equator.

There's also a daily tidal fluctuation, although for Earth the moon's proximity produces much more noticeable tidal effects. Tides produced by the system's star would be more powerful with a more massive star or a smaller distance between the star and the planet (as would be the case with Mercury)
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