Why October 1582 was ten days less

The 10 days missing in 1582 were due to the imperfection of the previous calendar.

Although the calendar was very precise at the time, the setting of leap years was still different from the Earth's orbital cycle, which deviated by about one day every 128 years. By the second half of the 16th century, the deviation had accumulated to 10 days.

In 1582, Pope Gregory XIII revised the calendar again. Leap years have been changed from 100 leaps every 400 years to 97 leaps every 400 years, that is, leap years that are divisible by 4, and every century year must be divisible by 400 to be considered leap years, so that 3300 years will produce a 1-day deviation. This is the common calendar in the world today - the Gregorian calendar, referred to as the Gregorian calendar, which is what we call the Gregorian calendar.

The 10 days of October 1582 were missing because the previous chronological calendar had been accumulated over a long period of time and had a deviation of 10 days, and in 1582, the then pope issued a papal decree on February 24, 1582, erasing the period from October 5 to 14, 1582, thus correcting the deviation of the calendar.

The Gregorian calendar used today is the Gregorian calendar, which was formerly known as the Julian calendar. The Julian calendar was implemented by the Roman Republic on January 1, 45 BC to replace the old Roman calendar. In the Julian calendar, the year is divided into 12 months, with 31 days in odd-numbered months, 30 days in even-numbered months except February, 29 days in a common year in February, and 30 days in leap years, so the number of days in a year is 365 days in a common year and 366 days in a leap year, with an average annual length of days.

In astronomy, the time it takes for the earth to revolve around the sun is a day in the true sense, and the cycle is about a day. Thus, after using the Julian calendar, an additional 11 minutes and 14 seconds were counted per year. Since the error is not too large, the first few years are irrelevant, but, year after year, the error accumulates, and the Julian calendar does not match the actual solar year.

By the 16th century, this deviation had reached 10 days. So in 1582, the then pope issued a papal decree on February 24, 1582, erasing the period from October 5 to 14, 1582, and the 10 days disappeared and never returned. October 4, 1582 was over, and the next day was already October 15, so the calendar returned to the solar year.

This is the common calendar in the world today - the Gregorian calendar, referred to as the Gregorian calendar, which is what we call the Gregorian calendar.

In 1582 there was October, but this month was 10 days less.

The 10 days missing in October 1582 were due to the imperfection of the previous calendar.

In 1582, the date of the vernal equinox (March 21) in the Julian calendar was 10 days different from the actual time of the Earth's revolution to the vernal equinox. Thus, when the Gregorian calendar was introduced, the day after Thursday, October 4, 1582 in the Julian calendar was changed to Friday, October 15, 1582 in the Julian calendar, i.e. 10 days were deleted, but the original cycle of the week remained the same.

There are also countries such as France that have chosen to make the day after Sunday, December 9, 1582 the day after the Gregorian calendar, Monday, December 20, 1582, and the same 10 days are deleted, but the original cycle of the week remains the same.

The root cause of this phenomenon is the existence of leap years.

The time it takes for the Earth to revolve around the Sun is days, and the length of the year is close to the number of days, so a good approximation can be obtained by taking 365 days as the base year and adding an additional day every four years. The Julian calendar was used until the 16th century.

The difference between the approximate and true length of the year at that time has accumulated for about 10 days. In order to eliminate this difference, Pope Gregory XIII set the day after October 4, 1582 in the Julian calendar as October 15, subtracting 10 days to rematch the calendar with the year of return, and began to use the new Gregorian calendar.

It may be a whole, or it will be messed up.

Because for those 10 days, no one was born, and no one died. Therefore, these 10 days are meaningless, and history is not recorded.

It's not that there is no October, it's that October is ten days less.

We know that the Earth's cycle around the Sun is days, and in the earlier Julian calendar, because one leap day was added every four years, February 29, on average, each Julian year was a day. Don't underestimate the difference between the day (about 11 minutes and 14 seconds). It doesn't matter if it's a year or two, or even ten or twenty years, but it's not trivial to accumulate over a few hundred years.

In fact, in the 13th century, the Julian year was eight days longer than the actual celestial phenomenon, and the vernal equinox became March 13, when astronomy prescribes that it should be March 21. In 1263, the brilliant thinker, scientist and philosopher Rogier Bacon sent a letter to Pope Urban IV urging them to study and solve this great problem (the Church at that time had the right to make the calendar).

But no one expected that this seemingly simple question would stump the Holy See and drag on for more than 300 years, causing the error to further expand to 10 days. It was not until 1582 that Pope Grigory XIII agreed to an amateur astronomer's proposal and issued a decree to change the Julian calendar to the Gregorian calendar, which in fact had two main essences: that is, to deduct the extra 10 days in that year, specifically to make the day after Thursday, October 4, 1582, Friday October 15 (which was supposed to be Friday, October 5); In the future, all century years that are not divisible by 400, such as 1700, 1800, 1900, etc., will no longer be used as leap years, and only those years that can be divisible by 400, such as 1600, 2000, etc., will still use leap years.

This effectively means that 397 leap days have been added every 400 years, which is a full three days less than before, and that in the new Gregorian calendar, the average length of a year is days, which is only a second short of the actual age, which is enough to guarantee that there will be no errors in two or three thousand years.

It's not that there is no October, but that October is 10 days less.

Because in this year Pope Gregory XIII revised the calendar according to practical needs. According to the revised calendar, there is a gap of ten days compared to the previous one. The Pope removed the 10 days directly, so in October 1582, there were only 21 days.

Later, in the following year, the revised calendar was continued.

The calendar we are familiar with today was modified by Pope Gregory XIII and called it the "Gregorian calendar". The calendar states that a year divisible by 4 is set as a leap year, and February of the year has 29 days, compared to 28 days in normal times. Under the influence of this calendar, only 3300 years will produce a 1-day deviation in the actual measurement.

By now, the Gregorian calendar has become the most commonly used calendar in the world, and it is also called the Gregorian calendar, the Gregorian calendar, etc., because it needs to be called simply.

Before the advent of the Gregorian calendar, people commonly used the Julian calendar, the implementation time is the famous Julius Caesar, after the emperor of ancient Rome, everything was in ruins, he adopted the advice of astronomers, based on the solar calendar, to carry out a detailed revision of the calendar, under this calendar, there will gradually be a great deviation, especially in the setting of leap years, and there is a great difference from today. In February of leap years, the time is no longer 29 days, but 30 days. However, it can better meet the needs of people's lives, and the implementation time is in 45 BC.

But the Julian calendar is based on the solar calendar, which was the most intelligent ancient Egyptian in ancient Egypt and discovered that the length of time between multiple high tides in their Nile was 365 days, but there is no way to calculate a more precise time. As a result, the ancient Egyptians divided the year into 12 months, each of which was 30 days, which was basically no different from the modern Gregorian calendar. But at the end of the day, 5 days are added as a festival, and there are some religious connotations in it.

Therefore, as a result, the Egyptian solar calendar began to be implemented, and it can guide people's production and life to a great extent.

In short, the development of the calendar is the solar calendar, the Julian calendar, and the Gregorian calendar. It was in 1582, when the Gregorian calendar was revised, that it was necessary to solve the 10 days of deviations, so in October of that year, 10 days were directly missing.

Because the Julian calendar used before had a little more time than the return year, in 1582, it was found that the vernal equinox of the Julian calendar was 10 days faster than it actually was, and in order to make up for the mistake, Gregory XIII jumped directly to October 15 on October 4, so it was 10 days less.

Julius Caesar stipulated that the Julian calendar should be used to calculate the number of days in a year, and a return year was a day, and the timekeeping time was 11 minutes and 14 seconds faster each year. By 1582, the error had accumulated for 10 days, and Pope Gregory XIII had completely erased the 10 days by way of a public statement.

In 45 BC, the Romans proposed the Julian calendar, until 1582, because the error of the Julian calendar added up to 10 days long, and then the extra 10 days directly caused the Romans to not be able to celebrate Easter on time, and Easter was very important to the Romans, so the Pope directly deleted the extra 10 days, so October 4, 1582, as soon as it was over, the second day was October 15

Because the time of the year is not a 365-day integer. Every year there are some deviations, and over time a few days are lost in order to correct the date.