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I'm writing a story about a sailor in an alien world, the world is exactly the same as Earth, except for one difference: this planet has nine moons. 5 moons go clockwise, while 4 go anti-clockwise All of these moons are similar in size of our own moon, and have similar orbits around the planet. However, my moons orbit at different altitudes, so they don't collide. What obstacles would the sailor face, if there were more moons. Will there also be any other gravity-made challenges, such as whirlpools or bigger waves. Also, would there possibly be more then two tides per day. This question has been identified as a possible duplicate of another question concerning tides, How would having multiple moons affect tides?, however my moons travel different way, so would this give different answers?