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Astronomical Factors Affecting Tides

Put simply, the gravitational attraction of the sun and moon combined with the earths rotation yield a "pull" on water bodies of the earth observed as the rise and fall of tides.

For a more in depth explanation of astronomical factors impacting changes in water level see the following sites:

Basic Explanation of How Moon and Sun Force Tidal Rise and Fall

• http://www.enchantedlearning.com/subjects/astronomy/moon/Tides.shtml

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