Why is there a 29/2 leap date?

Why is there a leap day? Why is there a leap year and why is there a leap month? Let us find out what a leap day is.

Why is there a 29/2 leap date?

1. Calendar of solar time is called solar calendar. The Earth spins a full circle around the sun 365 days and 6 hours. The calendar year has an integer of 365 days. Thus, a calendar year left over 6 hours and 4 years to accumulate 24 hours, equal to one day. Therefore, every 4 years will have a year of 366 days, called leap years. Calendar days are calculated in February. Therefore, February 2016 has 29 days.
2. The leap year calculation is based on the Gregorian calendar - the current standard calendar used on most of the world, the years divided by 4 are considered leap years.
3. The calendar according to the moon is called the lunar calendar. The average moon month has 29.5 days. 354 days in a lunar year, 11 days shorter than the calendar year. Every 3 years shorter than 33 days (more than 1 month).

What is a leap day?

In solar calendar every 4 years, there is a leap year, added in February a day that is called a leap day.

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In order to know which year of the solar calendar is a leap year, we only need to take the number of the year of the calendar and divide it by 4, but just enough, that year is the year of the solar calendar in February to add 1 day to 29 days. Because usually in February the solar calendar only has 28 days. For example: In 1996, try to see if it is a leap year? We take the number of the calendar year 1996 divided by 4 then it is 499 times exactly. So 1996 was a profitable year.

But note that for the round years of the Century (that is, the number of the year of the year has two numbers not at the end, we must take the first two numbers of the number to divide by 4. If the division is sufficient, that year is profitable) .

In addition, there are some exceptions to this rule because a calendar year is slightly shorter than 365.25 days. Years divisible by 100 are considered leap years only if they are divisible by 400. For example, 1600 and 2000 are leap years but 1700, 1800 and 1900 are not leap years. Similarly, 2100, 2200, 2300, 2500, 2600, 2700, 2900 and 3000 are not leap years but 2400 and 2800 are leap years. According to this principle, the average year has 365 + 1/4 - 1/100 + 1/400 = 365.2425 days, ie 365 days 5 hours 49 minutes and 12 seconds.

The reason for this is because the Gregorian calendar was created to ensure that the spring equinox in Europe falls on March 21, to ensure that Easter day can be adjusted more clearly on the spring day.

One year of spring equinox (between two successive spring equinoxes) is about 365,242375 days.

The rules for calculating the Gregorian leap year take an average year of 365.2425 days.

This very small difference (over 0.0001 days) means that the wrong amount of time will accumulate enough for one day in about 8,000 years. But in the time of 8,000 years, the length of one year of spring equinox will also change in a quantity that cannot be predicted accurately. So the leap year rule of the Gregorian calendar is sufficiently satisfying.

So it's easy to know which year is a leap year right? The question is why the leap day has been settled. Hope to bring you useful knowledge in life.

Leap year is year:

- According to the solar calendar, the year contains an extra day (February 29). (Regular years of February are only 28 days)
- According to the lunar-solar calendar, the year contains the 13th month.
The purpose is to ensure the synchronization of the year on the calendar with five astronomical or five weather events.

Leap month is the month:

- According to the solar calendar: February is the 29th day, normally February is only 28 days.
- According to the lunar calendar: there are 2 times a year, for example, the year has September 2, or another month.