Introduction to the Sun and the Moon: Go a few steps further and you can see a pool with a diameter of more than 40 meters. There are two 16-ton balls in the middle, representing the sun and the moon respectively. Here, you can see a very peculiar astronomical phenomenon, that is, "the sun and the moon shine together". In late summer and early autumn, when the sun has not yet set and the moon begins to rise, the two balls will produce two projections in different directions and intertwined, hence the name "Sun and Moon".