1. The meaning of the word "nautical". Hang is pronounced as háng, and its original meaning is to sail across the water in a boat or sail in a small boat, and by extension refers to boats, sailing, etc.
2. The five elements belong to water. Water - said to "moisten the lower parts". People are smart and can figure things out. Water represents wisdom, which means observing things in detail, being able to predict the signs of anything, and being good at managing power and making strategic plans. Water starts from Hai (the beginning of winter), flourishes from Zi (the culmination of the winter solstice), and is grounded in Chou (Xiaohan). When the sky is cold and the ground freezes, when the sky is cold and the ground Qi is grounded, the ground begins to freeze, which is the Chou month (Xiaohan).