January is big, February is flat, March is big, April is small, May is big, June is small, July is big, August is big, September is small, October is big, November is small and December is big. 135780 wax, 3 1 day never goes bad, 469 winter is 30 days, and the average year is February 28th.

It means that different months of the year correspond to different days. Among them, the big month is 3 1 day, the small month is 30 days, and the average month is 28 days.

Extended data In the modern Gregorian calendar, there are 365 days in a normal year and 366 days in a leap year.

There is a leap year every four years, with 28 days in February and 365 days in * *; There is a leap month in a leap year, with one more day in February and 366 days in the whole year. According to the calendar, you can calculate the date by specifying the number of days in each month, for example, 10 is 1 day in October, 28 days in February and 3 1 day in March. ...

It should be noted that in February of leap year, the formula of the topic is no longer applicable, and February is 29 days instead of 28 days.

It is not difficult to remember the big moon and the small moon. In addition to reciting the formula of the topic, there are also ways to hit people with fists.

After the fist is clenched in the left hand, count from the index finger. The big moon is convex and the small moon is concave.