I was at the beach the other day fishing I came up with a couple of questions that I need some other answers to. How exactly do the tides work? I have heard that it is the moon that controls the tides but I don't know if I fully buy that theory. If that is the case, why are there (for the most part) two highs and two lows in a day? The moon doesn't orbit the earth twice a day. Also, when there is a high tide say in WA state does that mean that the tide is up all along the western coast of north and south america. What about the Western Hemisphere vs the Eastern?