The Relationship between Tomb-Sweeping Day and Tomb-Sweeping Day Qi

The relationship between Tomb-Sweeping Day and Tomb-Sweeping Day Qi is as follows:

Tomb-Sweeping Day Qi is determined according to the starting time of the last solar term vernal equinox, which is postponed for fifteen days. The fifteenth day after the vernal equinox every year is Tomb-Sweeping Day Qi, but Tomb-Sweeping Day doesn't think so. Tomb-Sweeping Day is set according to a strict system, which is fundamentally different. Technically, this is not what we often say, Qingming refers to Tomb-Sweeping Day, where the climate is warm and Tomb-Sweeping Day is a legal rest day. Tomb-Sweeping Day has three days, but not every first day in Tomb-Sweeping Day coincides with Tomb-Sweeping Day.