by 
Ericat
ANSWERS: 2
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Tidal forces arise from both the moon and the sun, with the moon's effect about twice that from the sun (the sun is much, much more massive but much, much farther away). The overall tidal effect depends on the relative alignment of the moon and sun, which varies from one tide to the next. When both bodies are aligned with respect to the earth, near full moons or new moons, the combined effect is greatest, while during half moons -- when the sun and moon are at right angles -- the effects tend to cancel out a bit, creating a smaller effect. Since a 24-hour cycle is defined by the earth's rotation with respect to the sun, every 24 hours the moon has moved a little in its rotation around the earth. Hence they are not synchronized.
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Tides are caused by the gravitational pull of the moon and, to a lesser extent, the sun. The time of moonrise varies enormously and therefore so do the times of the tides.
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