When is the summer vacation of 23 years?

August 23rd. According to the calendar, the 23-year summer heat began on August 26th, 2003 and ended on September 10. Being in summer is the fourteenth of the twenty-four solar terms. Dou refers to Wu (southwest), and the yellow meridian of the sun reaches 150, which is celebrated on August 22-24 of the Gregorian calendar every year. Being in the heat is "out of the heat", that is, out of the heat.