I am writing a sci fi/fantasy novel with a planet that has three moons. I have reached the point in the book where I need to accurately describe their effect on the tides and want to make sure I have this right. It is difficult to compare them to large gas planets with multiple moons because of the difference in mass. I have worked out that the moons cause a balance in axis tilt and that the give and take gravity between the planet and moons causes the moons to have atmospheres and are farmable. This is a watery planet with large oceans. Would cities even be able to be built near the shore? Do I need to incorporate massive sea walls? Also, any ideas on what ship commerce would be like?
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