Why does the solar calendar leap one day every four years, but the lunar calendar is one month?

The Gregorian calendar means that the earth revolves around the sun for one year, and the time is 365 days, 5 hours, 48 minutes and 46 seconds. A normal year is 365 days. The remaining 5 hours, 48 minutes and 46 seconds are equivalent to one day in four years, so the solar calendar only spans one day in four years. The solar calendar is to master cold and heat. The lunar calendar is the orbit of the moon around the earth. Its orbit time is 29 days, 12 hours, 12 months is one year. The actual time is 354 days, one year is less than the solar calendar 1 1 day, and three years is 33 days less. This is why we often see that the lunar calendar and the solar calendar are always wrong. In order to accurately grasp the cold and heat in the lunar calendar, it must leap every two or three years, and every time it must leap for a whole month. Once every three years is not enough, 19 is only seven times. The way to leap in a month is to use the 24 solar terms card. For example, April in the 20 12 lunar calendar is April 30th, and May is April, so this year is April.