Leap year jingle

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In the Gregorian calendar, the year is divided into a normal year and a leap year, and a year with a leap day is called a year with a leap day.leap year.Its source is that the earth"s orbit around the sun is 365 days, 5 hours, 48 ​​minutes and 46 seconds (365.24219 days), that is, a tropical year.The Gregorian calendar sets a year as 365 days, and the remaining time is about four years.Therefore, a normal year has 365 days per year, February has 28 days, leap years have 366 days, and February has 29 days.

Difference between a normal year and a leap year

A normal year:refers to a year without a leap day in the Gregorian calendar or a year without a leap month in the lunar calendar.Years that are not divisible by 4 are called ordinary years, such as 2005, 2006, 2007.There are only 28 days in February in a normal year.

Leap year:Any year with a leap day (29th in February) in the solar calendar is called a leap year.Leap years are established to make up for the time difference between the number of days in a year and the actual revolution cycle of the earth caused by human calendar regulations.Years that are divisible by 4 but not by 100 are called leap years, such as 2004.

Century leap year:A year divisible by 400 is a century leap year, such as 2000.

Leap year jingle in ordinary years

Remember ordinary years and leap years, you have to look at February.

February 28 in normal years and February 29 in leap years.

You can divide the year by four, leaving a normal year and no leap.

Every four years is a leap, which is a dead rule.

The year number is divided by four, nothing is a leap year.

The number of days is 366, which is 29 days in February.

The year number is divided by four, and the remainder is one, two, three.

On a normal year, there are 28 days in February.

In 2000, it is not easy to count as special.

The divisor is four hundred, and the remainder is a leap year.

Once every four years, not all of every hundred years, and every four hundred years.

It is easy to judge normal years and leap years; if the one digit is odd (singular), there is no need to divide, and there is a remainder at first glance; Divide by 4 to judge; if there is a remainder, it is a normal year, and if it is clean, it is a leap year.

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