Today, we all know that the Moon’s gravity causes the tides, but what did people think before Sir Isaac Newton discovered that gravity is a universal force? I recently heard Jonathan White interviewed on NPR; he is the author of Tides: The Science and Spirit of the Ocean. It turns out that serious people used to hold all manner of fanciful explanations for the tides. Three that I remember from the interview are:
- A woman is lifting her skirt and lowering it.
- A very large beast in the depths of the ocean is breathing in and out.
- The rays of the Moon heat rocks below the ocean, which causes the depths of the ocean to boil. Boiling in the region below the Moon causes the water level to rise.
Of course, these explanations are all wrong but some of them are better attempts at the truth than others. Put yourself in the time when the correct answer was not known. Which explanation would you prefer, and why?