Moon and Tides

The moon effects the water in terms of gravity.  Depending on the position of the moon in the sky, and in which phase it's in, the ocean will have either a low or a high tide.  Example, when it's a new moon, the high tide might go up to 8 feet at 11 in the morning, but then go back down to a low tide of below zero at six in the afternoon.  But as already said before, the moon is always somewhere different every time, especially in different times of the year.  This makes predicting the tides, nearly impossible.