Last Update: Sep 27, 2022.

**Submitted by: Maisie Gracia**

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(74 votes)

### Why do you think we have leap years every 4 years?

Why Are Leap Years Necessary? Adding an extra day every four years **keeps our calendar aligned correctly with the astronomical seasons**, since a year according to the Gregorian calendar (365 days) and a year according to Earth's orbit around the Sun (approximately 365.25 days) are not the exact same length of time.

A year is 365.24 days long — that's why we have to skip a leap day every 100 years.

There is a leap day every 4 years because **Earth completes one revolution around the sun in around 365 days and 6 hours**. Over a period of 4 years, the extra 6 hours from every year get added up to become an entire day (6*4=24 hours). Hence, we have a leap day/leap year every 4 years.

Explanation: There is a leap day every 4 years **because Earth completes one revolution around the sun in around 365 days and 6 hours**. Over a period of 4 years, the extra 6 hours from every year get added up to become an entire day (6*4=24 hours). Hence, we have a leap day/leap year every 4 years.

#### What Is A Leap Year?

But approximately every four years, February has 29 days instead of 28. So, there are 366 days in the year. This is called a leap year. Why do we have leap years?YearDays in YearLeap Year?2020366Yes

But approximately every four years, February has 29 days instead of 28. So, there are 366 days in the year. This is called a leap year. Why do we have leap years?YearDays in YearLeap Year?2017365No2018365No2019365No2020366Yes

Each month has either 28, 30, or 31 days during a common year, which has 365 days. During leap years, which occur nearly every 4 years, we add an extra (intercalary) day, Leap Day, on 29 February, making leap years 366 days long.

Each month has either 28, 30, or 31 days during a common year, which has **365 days**. During leap years, which occur nearly every 4 years, we add an extra (intercalary) day, Leap Day, on 29 February, making leap years 366 days long.

#### What Is A Leap Year?

That is a leap year. In an ordinary year, if you were to count all the days in a calendar from January to December, you'd count 365 days. But approximately every four years, February has 29 days instead of 28. Why do we have leap years?YearDays in YearLeap Year?2018365No2019365No2020366Yes

The Gregorian calendar is divided into 12 months. Each month has either 28, 30, or 31 days during a common year, which has 365 days. During leap years, which occur nearly every 4 years, we add an extra (intercalary) day, Leap Day, on 29 February, making leap years 366 days long.

The extra day, February 29, is added to the month of February. We have leap years because instead of 365 days, the Earth really takes a few minutes less than 365-1/4 days (365.24219) to go completely around the Sun. Without leap years, the seasons would start one day earlier on the calendar every four years.

Leap Years Have an Extra Day Leap years have 366 days instead of the usual 365 days and occur almost every four years.Feb 29, 2020

#### Leap Year

Leap Years Have an Extra Day Leap years have 366 days instead of the usual 365 days and occur almost every four years.Feb 29, 2020

The 12 Months of the Year. A year is divided into 12 months in the modern-day Gregorian calendar. The months are either 28, 29, 30, or 31 days long. During leap years, which occur nearly every 4 years, we add an extra (intercalary) day, Leap Day, on 29 February, making leap years 366 days long.

Leap Day generally happens every four years. It's when we add February 29 to the calendar. This causes the year to become 366 days long instead of the typical 365. Years containing a leap day are called leap years.