The lunar calendar begins in the year of the moon column. Is this month a solar calendar or a lunar calendar?

The starting method of the moon column is based on the solar terms. Every solar term (pay attention to the solar term rather than the neutral gas), the moon column alternates, marking the changes of the four seasons and the news of the profit and loss of the five elements. The rise and fall of the ten gods are all in the word moon, so it is the outline of the four pillars. The moon column, a branch of the lunar calendar, represents the festival when people are born. Note that the monthly branch is not divided by the first day of each month in the lunar calendar, but by festivals. The festival before the handover is the festival of last month, and the festival after the handover is the festival of next month. See 30 or 7? This is not contradictory, because one is the solar calendar, which should be the lunar calendar. Actually, it's all the same day.