'I am NOT an alcoholic': Gerard Butler reveals the real reason behind his stretch in rehab. Actor Gerard Butler has revealed his rehab agony and set the record straight over rumours of his alcoholism. The 42-year-old Scot checked into the Betty Ford Centre in February for three weeks after being injured in a surfing accident. He said: 'Maybe a stronger person wouldn't have needed to go. But I'm glad I did it.
Gravity is one major force that creates tides. In 1687, Sir Isaac Newton explained that ocean tides result from the gravitational attraction of the sun and moon on the oceans of the earth (Sumich, J.L., 1996).
Government agencies throughout the world measure tides daily to predict when the two highest and lowest tides in an area will occur and how high they will be. This compilation of data is called a tide table.overnment agencies throughout the world measure tides daily to predict when the two highest and lowest tides in an area will occur and how high they will be. This compilation of data is called a tide table.