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Karl_Smith comments on Rationality quotes: March 2010 - Less Wrong
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And the Earth is slowly curving in its orbit, generating an apparent centrifugal force that decreases your weight at midnight, and increases your weight at noon. Except for a very tiny tidal correction, these two forces exactly cancel which is why the Earth stays in orbit in the first place. This argument would only be valid if the Earth were suspended motionless on two giant poles running through the axis or something.
This was my original thought until I realized that of course it cancels or else the earth would crack into pieces.
The non-cracking of the Earth demonstrates only that the tidal force is small relative to that required to crack the Earth apart, which may not be a particularly strong upper bound on human scales. :) However, RobinZ's numbers show that it's also small relative to human weights, so there we go.