What was the name of July 22nd in ancient times?

Great summer, one of the 24 solar terms. On July 23rd or 24th every year, the sun reaches longitude 120. Twenty-four solar terms: "in mid-June, ... it was hot, small and small, small at the beginning of the month, and big in the month, and it is still hot now." At this time, it is the hottest period of the year, with the highest temperature and the fastest growth of crops, and droughts, floods and windstorms are the most frequent in most areas. It is very important to grab crops and seeds, prevent drought and drainage, and manage fields. There are folk customs such as drinking tea, drying ginger and burning incense.

circumference ratio

There are two special days to celebrate Pi: pi day and Pi Approximation Day. March 14 is the official date of pi day, and there are two approximate dates for pi, July 22nd or April 26th. Polish National Renaissance Festival

St Mary's Day in Ramaglia.

Approximate date of pi

Rat-catching Day in Hamelin, Germany