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The force on parts of an extended body in a non-uniform gravitational field, due to residual gravitational attraction between the overall effect on the body and the expected effect on the point in question. Tidal forces are most notably in large moons orbiting near their primaries.

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Are we slightly lighter during the day and slightly heavier at night, owing to the force of ...

Setting aside tidal force. Distance to sun aprox. 150*10^9m +(-)637*10^3m ,and since earth(masspoint) always in free fall it makes on average 0.006m/s2*(150E9m+637e3m)^2/(150E9m-637E3m)^2 -0.006m/s2 = …
Timo Moilanen's user avatar