What is a big moon, a small moon and a flat moon?

There are seven big months, four small months and one flat month in a year. The seven big months are January, March, May, July, August, October and December of the Gregorian calendar every year. The four abortion months are April, June, September, 1 1 month; The average month is February. The months in the Gregorian calendar are divided into big months and small months. The big moon is 365,438+0 days, and the small moon is 30 days. Only the flat month in February has only 28 days (normal year) or 29 days (leap year).

Time:

Time is a continuous and orderly expression of material movement changes, including two concepts: time and time period. Time is a parameter used by human beings to describe the process of material movement or the occurrence of events. The determination of time depends on the law of material circulation that is not affected by the outside world. The time measurement system based on the earth's rotation is called universal time system. Time measurement of time, day, month, year and century belongs to the calendar category in astronomy. Time is one of the seven basic physical quantities in physics, and the symbol is T. In the International System of Units (SI), the basic unit of time is seconds, and the symbol is S.