How many days are there in 202 1 xiaoshu? 202 1 introduction of Xiao Shu.

2. Every year around July 7th, when the sun reaches longitude 105, it is called "Little Summer" solar term. "Twenty-four solar terms": "Summer is also hot, divided into small summer, small at the beginning of the month, large in the month, and still small today." Summer is hot. The ancients thought that the summer heat period was not the hottest time of the year, so it was called summer heat.