In which solar term did the ancients worship "Lei Gong"

Tomb-Sweeping Day, also known as March Festival in ancient Tomb-Sweeping Day, is one of the 24 solar terms, and Tomb-Sweeping Day is celebrated from April 4th to 6th in the Gregorian calendar every year. Among the 24 solar terms, Qingming is the only solar term that is both a solar term and a festival. Tomb-Sweeping Day is a traditional festival in China, and it is also the most important festival to worship ancestors and sweep graves. Grave-sweeping is commonly known as going to the grave and offering sacrifices to the dead. Most Han people and some ethnic minorities visit graves in Tomb-Sweeping Day.