What festival is the eighth day of the eighth lunar month?

August 18th of the lunar calendar is a folk tide-watching festival in Zhejiang.

Tide-watching Festival, a folk festival. Popular in Hangzhou, Zhejiang, Jiaxing and other places. Every year on August 18th of the lunar calendar, the Qiantang River in Zhejiang Province will have a spring tide. At high tide, the waves are rough and magnificent. This festival has been around since the Southern Song Dynasty. Hangzhou people have been watching the tide since the eleventh, and they came out from the sixteenth and eighteenth cities. From Miaozitou to Pagoda of Six Harmonies, buildings along the river are rented as spectators.

This festival has been around since the Southern Song Dynasty. Hangzhou people have been watching the tide since the eleventh, and they came out from the sixteenth and eighteenth cities. From Miaozitou to Pagoda of Six Harmonies, buildings along the river are rented as spectators. Since the early Qing Dynasty, tidal observation has been moved to Haining, Jiaxing, due to the diversion of the river.

From the perspective of modern science, the ocean tides on the earth are periodic movements formed by the gravitational force of celestial bodies (mainly the moon and the earth) and the centrifugal force generated by the earth's rotation. On the first and fifteenth day of the lunar calendar, the earth, the sun and the moon are almost in a straight line, and the gravity of the sun and the moon is very strong, which is easy to form a spring tide.