Why is there an extra day in a leap year

Almost every four years, we will add an extra day to the calendar on February 29th, which is the next day. In short, these extra 24 hours are built into the calendar to ensure it is consistent with the sun movement around Earth. Although the modern calendar contains 365 days, the actual time required for the Earth to orbit its stars is slightly longer, at 365. 2421 days. This difference seems to be negligible, but for decades and centuries, the season of missing a quarter can add up. To ensure consistency with the real astronomical year, it is necessary to add an extra day to compensate for the lost time and synchronize the calendar with the sky. The Egyptians first calculated the needs of the Jubilee, but it was not until the Roman dictator Julius Caesar ruled that this custom arrived in Europe. Until then, the Roman calendar was carried out on a chaotic model of the moon, often requiring an additional month to maintain the consistency of the celestial body.

Finally, in 46 BC, Caesar and astronomer Sosigoni modified the Roman calendar, including 12 months and 365 days. This БаньCalendarБ also compensates for the Sun Year by adding one day every four years. The Caesars model helped re-adjust the Roman calendar, but it has a small problem. Because the solar year is only. It is 242 days older than the calendar, not even. 25, a leap year is added every four years, in fact, the remaining time is about 11 minutes per year. This small difference means that the Julian calendar deviates from the day every 128 years and by the 14th century it has deviated from the 10 days of the Sun. In order to solve this problem, Pope Gregory XIII formulated the revised Gregory calendar in 1582. In this model, leap years occur every four years, except for years that can be divisible by 100 instead of 400 divisibility.

Although the standard calendar year is 365 days, the Earth actually needs 365 days, 5 hours, 48 ​​minutes and 46 seconds to completely revolve around the sun. (This is called the Year of the Sun). In order to keep the calendar cycle in sync with the season, one day is added every four years on February 29 (usually).

The Julian calendar (established by Julius Caesar in 46 BC) introduced the Gregorian calendar of Egypt into the Roman world, standardizing the 365-day year and creating the predecessor of our current Jubilee. February 29th was not reflected on the Julian calendar but was repeated every four years on February 23. You might ask, the solar sun is not a full 365 days and 6 hours, then an extra 11 minutes and 14 seconds? The additional calendar reforms in 1500 added a special rule to adjust for this difference.

In 1582, Pope Gregory XIII created a slightly modified calendar to better explain the next day. This new system is called the Gregorian calendar. This new system means that a century without a century (such as 1900) will be a leap year, except for the century that can be divisible by 400 years (such as 2000). In order to correct the calendar, the Pope eliminated the calendar from October 5 to October 14, 1582. The calendar moves directly from the fourth to the fifteenth to realign the date with the season. It feels like science fiction, and I think it was removed from the calendar for ten days in 1582. But where does the word leap year come from? In days when 365 days are called perennial, the fixed date is advanced one day of the week each year. For example, Christmas fell on Thursday in 2014 and Friday in 2015. With the insertion of the next day, the date (after February) is two days ahead of the day. In 2016, Christmas will jump to Sunday on Saturday. Anyway, will you celebrate the next day?

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