2016 is a leap year with 366 days instead of the usual 365. Leap year was proposed to synchronize calendars. Did you know that not every 4th year is a leap year?Why leap year is considered unlucky, and what signs are associated with this?Here are a few facts you may not know about leap year.
What does leap year mean?
1 . A leap year is a year that has 366 days rather than the usual 365. An additional day in a leap year is added in February - February 29 (leap day).
An additional day in a leap year is necessary because a full revolution around the Sun takes a little more than 365 days, or rather 365 days, 5 hours, 48 minutes and 46 seconds.
People once followed a 355-day calendar with an additional 22-day month every two years. But in 45 BC. Julius Caesar, together with the astronomer Sosigenes, decided to simplify the situation, and the Julian 365-day calendar was developed, with an extra day every 4 years to compensate for the extra hours.
This day was added in February because it was once the last month in the Roman calendar.
2 . This system was supplemented by Pope Gregory XIII (who introduced Gregorian calendar), who coined the term "leap year" and declared that year, multiple of 4 and multiple of 400, but not multiple of 100, is a leap year.
So, according to the Gregorian calendar, 2000 was a leap year, but 1700, 1800 and 1900 were not.
What are leap years in the 20th and 21st centuries?
1904, 1908, 1912, 1916, 1920, 1924, 1928, 1932, 1936, 1940, 1944, 1948, 1952, 1956, 1960, 1964, 1968, 1972, 1976, 1980, 1984, 1988, 1992, 1996, 2000, 2004, 2008, 2012, 2016, 2020, 2024, 2028, 2032, 2036, 2040, 2044, 2048, 2052, 2056, 2060, 2064, 2068, 2072, 2076, 2080, 2084, 2088, 2092, 2096
February 29 is leap day
3 . February 29 is considered the only day when a woman can propose marriage to a man. This tradition began in 5th century Ireland when St. Brigid complained to St. Patrick that women had to wait too long for suitors to propose.
Then he gave women one day in a leap year - the last day in the shortest month, so that the fair sex could propose to a man.
According to legend, Brigitte immediately knelt down and proposed to Patrick, but he refused, kissing her on the cheek and offering her a silk dress to soften her refusal.
4 . According to another version, this tradition appeared in Scotland, when Queen Margaret, at the age of 5, announced in 1288 that a woman could propose to any man she liked on February 29.
She also made a rule that those who refused had to pay a fine in the form of a kiss, a silk dress, a pair of gloves or money. To warn suitors in advance, the woman was required to wear trousers or a red petticoat on the day of the proposal.
In Denmark, a man who refuses a woman's marriage proposal must provide her with 12 pairs of gloves, and in Finland - fabric for a skirt.
Leap year wedding
5 . One in five couples in Greece avoid getting married on a leap year, as it is believed to brings bad luck.
In Italy it is believed that during a leap year the woman becomes unpredictable and at this time there is no need to plan important events. So, according to the Italian proverb "Anno bisesto, anno funesto". (“A leap year is a doomed year”).
Born on February 29
6 . The chances of being born on February 29th are 1 in 1461. Around the world, about 5 million people were born on Leap Day.
7 . For many centuries, astrologers believed that Children born on Leap Day have unusual talents, a unique personality and even special powers. Among famous people Those born on February 29 can name the poet Lord Byron, composer Gioachino Rossini, actress Irina Kupchenko.
8. In Hong Kong, the official birthday for those born on February 29 is March 1 in normal years, while in New Zealand it is February 28. If you time it correctly, you can celebrate while traveling from one country to another longest birthday in the world.
9. The city of Anthony in Texas, USA is a self-proclaimed " world capital of leap year". A festival is held here annually, where those born on February 29 gather from all over the world.
10. Record the largest number generations born on leap day, belongs to the Keogh family.
Peter Anthony Keogh was born on February 29, 1940 in Ireland, his son Peter Eric was born on February 29, 1964 in the UK, and his granddaughter Bethany Wealth was born on February 29, 1996.
11. Karin Henriksen from Norway holds the world record the largest number of children born on leap day.
Her daughter Heidi was born on February 29, 1960, son Olav on February 29, 1964, and son Lief-Martin on February 29, 1968.
12. In the traditional Chinese, Jewish and ancient Indian calendars, not a leap day is added to the year, but a whole month. It is called the "intercalary month". It is believed that children born in a leap month are more difficult to raise. In addition, it is considered unlucky to start serious business during a leap year.
Leap year: signs and superstitions
Since ancient times, a leap year has always been considered difficult and bad for many undertakings. In popular belief, leap year is associated with Saint Kasyan, who was considered evil, envious, stingy, unmerciful and brought misfortune to people.
According to legend, Kasyan was a bright angel to whom God trusted all plans and intentions. But then he went over to the side of the Devil, telling him that God intended to overthrow all satanic power from heaven.
For his betrayal, God punished Kasyan by ordering him to be beaten on the forehead with a hammer for three years, and in the fourth year to be released to earth, where he committed unkind deeds.
There are many signs associated with leap year:
Firstly, on a leap year you can't start anything. This applies to important matters, business, major purchases, investments and construction.
Is it possible to get married on a leap year?
Leap year is considered extremely unsuccessful for marriage. Since ancient times, it was believed that a wedding played in a leap year would lead to an unhappy marriage, divorce, infidelity, widowhood, or the marriage itself would be short-lived.
This superstition may be due to the fact that in a leap year, girls could woo anyone they liked young man, who could not refuse the offer. Often such marriages were forced, and therefore family life didn't ask.
However, you should treat these signs wisely and understand that everything depends on the spouses themselves and how they build the relationship. If you do plan a wedding, there are several ways to mitigate the “consequences”:
Brides are advised to wear long dress for a wedding, covering the knees to make the marriage last.
Wedding dress and other wedding accessories It is not recommended to give it to anyone.
The ring should be worn on the hand, not the glove., since wearing a ring on a glove will cause the spouses to take marriage lightly
To protect the family from troubles and misfortunes, a coin was placed in the shoes of the bride and groom.
What should you not do during a leap year?
· During a leap year don't carol at Christmas time, since it is believed that you can lose your happiness. Also, by sign, a caroler who dresses up as an animal or monster can take on the personality evil spirits.
· Pregnant women should not have their hair cut before giving birth, since the child may be born unhealthy.
· During a leap year do not start building a bathhouse, which can lead to illness.
· You can't pick mushrooms, as it is believed that they all become poisonous.
· In a leap year there is no need to celebrate the appearance baby's first tooth. According to legend, if you invite guests, your teeth will be bad.
· You can't change jobs or apartments. According to the sign, the new place will turn out to be joyless and turbulent.
· If a child is born on a leap year, it must be baptize as quickly as possible, and choose godparents among blood relatives.
· Elderly people are not allowed buy things for the funeral in advance, as this can bring death closer.
· You can't get a divorce, because in the future you will not be able to find your happiness.
Did you know that not every 4th year is a leap year? Why is a leap year considered unlucky, and what signs are associated with it?
What does leap year mean?
1. A leap year is a year in which there are 366 days, rather than the usual 365. An additional day in a leap year is added in February - February 29 (leap day).An extra day in a leap year is necessary because a full revolution around the Sun takes a little more than 365 days, or rather 365 days, 5 hours, 48 minutes and 46 seconds.
People once followed a 355-day calendar with an additional 22-day month every two years. But in 45 BC. Julius Caesar, together with the astronomer Sosigenes, decided to simplify the situation, and the Julian 365-day calendar was developed, with an extra day every 4 years to compensate for the extra hours.
This day was added in February because it was once the last month in the Roman calendar.
2. This system was supplemented by Pope Gregory XIII (who introduced the Gregorian calendar), who coined the term "leap year" and declared that a year that is a multiple of 4 and a multiple of 400, but not a multiple of 100, is a leap year.
So, according to the Gregorian calendar, 2000 was a leap year, but 1700, 1800 and 1900 were not.
What are leap years in the 20th and 21st centuries?
1904, 1908, 1912, 1916, 1920, 1924, 1928, 1932, 1936, 1940, 1944, 1948, 1952, 1956, 1960, 1964, 1968, 1972, 1976, 1980, 1984, 1988, 1992, 1996, 2000, 2004, 2008, 2012, 2016, 2020, 2024, 2028, 2032, 2036, 2040, 2044, 2048, 2052, 2056, 2060, 2064, 2068, 2072, 2076, 2080, 2084, 2088, 2092, 2096February 29 is leap day
3. February 29 is considered the only day when a woman can propose marriage to a man. This tradition began in 5th century Ireland when St. Brigid complained to St. Patrick that women had to wait too long for suitors to propose. Then he gave women one day in a leap year - the last day in the shortest month, so that the fair sex could propose to a man.
According to legend, Brigitte immediately knelt down and proposed to Patrick, but he refused, kissing her on the cheek and offering her a silk dress to soften her refusal.
4. According to another version, this tradition appeared in Scotland, when Queen Margaret, at the age of 5, announced in 1288 that a woman could propose to any man she liked on February 29.
She also made a rule that those who refused had to pay a fine in the form of a kiss, a silk dress, a pair of gloves or money. To warn suitors in advance, the woman was required to wear trousers or a red petticoat on the day of the proposal.
In Denmark, a man who refuses a woman's marriage proposal must provide her with 12 pairs of gloves, and in Finland - fabric for a skirt.
Leap year wedding
5. Every fifth couple in Greece avoids getting married on a leap year, as it is believed to bring bad luck. In Italy, it is believed that during a leap year a woman becomes unpredictable, and there is no need to plan important events at this time. So, according to the Italian proverb "Anno bisesto, anno funesto". (“A leap year is a doomed year”).
Born on February 29
6. The chances of being born on February 29th are 1 in 1461. Around the world, about 5 million people were born on Leap Day. 7. For many centuries, astrologers believed that children born on Leap Day have unusual talents, a unique personality and even special powers. Among the famous people born on February 29 are the poet Lord Byron, composer Gioachino Rossini, and actress Irina Kupchenko.
8. In Hong Kong, the official birthday for those born on February 29 is March 1 in normal years, while in New Zealand it is February 28. If you time it right, you can celebrate the longest birthday in the world while traveling from one country to another.
9. The town of Anthony in Texas, USA is the self-proclaimed “Leap Year Capital of the World.” A festival is held here every year, where those born on February 29 gather from all over the world.
10. The record for the largest number of generations born on a leap day belongs to the Keogh family.
Peter Anthony Keogh was born on February 29, 1940 in Ireland, his son Peter Eric was born on February 29, 1964 in the UK, and his granddaughter Bethany Wealth was born on February 29, 1996.
11. Karin Henriksen from Norway holds the world record for giving birth to the largest number of children on a leap day.
Her daughter Heidi was born on February 29, 1960, son Olav on February 29, 1964, and son Lief-Martin on February 29, 1968.
12. In the traditional Chinese, Jewish and ancient Indian calendars, not a leap day is added to the year, but a whole month. It is called the "intercalary month". It is believed that children born in a leap month are more difficult to raise. In addition, it is considered unlucky to start serious business during a leap year.
Leap year: signs and superstitions
Since ancient times, a leap year has always been considered difficult and bad for many undertakings. In popular beliefs, leap year is associated with Saint Kasyan, who was considered evil, envious, stingy, unmerciful and brought misfortune to people. According to legend, Kasyan was a bright angel to whom God trusted all plans and intentions. But then he went over to the side of the Devil, telling him that God intended to overthrow all satanic power from heaven.
For his betrayal, God punished Kasyan by ordering him to be beaten on the forehead with a hammer for three years, and in the fourth year to be released to earth, where he committed unkind deeds.
There are many signs associated with leap year:
Firstly, you can’t start anything on a leap year. This applies to important matters, business, major purchases, investments and construction.
It is also not recommended to change anything during a leap year, as this will not bring the desired result and can even be disastrous. During such a period, you should not plan to move to new house, job change, divorce or marriage.
Is it possible to get married on a leap year?
A leap year is considered extremely unlucky for marriage. Since ancient times, it was believed that a wedding played in a leap year would lead to an unhappy marriage, divorce, infidelity, widowhood, or the marriage itself would be short-lived. This superstition may be due to the fact that in a leap year, girls could woo any young man they liked, who could not refuse the proposal. Often such marriages were forced, and therefore family life did not work out.
However, you should treat these signs wisely and understand that everything depends on the spouses themselves and how they build the relationship. If you do plan a wedding, there are several ways to mitigate the “consequences”:
Brides are advised to wear a long dress for their wedding that covers their knees to make the marriage last.
It is not recommended to give a wedding dress and other wedding accessories to anyone.
The ring should be worn on the hand, not the glove, since wearing a ring on the glove will cause the spouses to take the marriage lightly
To protect the family from troubles and misfortunes, a coin was placed in the shoes of the bride and groom.
The bride must keep the spoon from which the groom ate, and on the 3rd, 7th and 40th day after the wedding, the wife had to give her husband something to eat from this particular spoon.
What should you not do during a leap year?
· During a leap year, people do not carol at Christmas time, as it is believed that you can lose your happiness. Also, according to a sign, a caroler who dresses up as an animal or monster can take on the personality of an evil spirit. · Pregnant women should not cut their hair before giving birth, as the baby may be born unhealthy.
· During a leap year, you should not start building a bathhouse, which can lead to illness.
· During a leap year, it is not recommended to tell others about your plans and intentions, as luck may change.
· It is not recommended to sell or exchange animals and kittens should not be drowned, as this will lead to poverty.
· You cannot pick mushrooms, as it is believed that they all become poisonous.
· During a leap year, there is no need to celebrate the appearance of a child's first tooth. According to legend, if you invite guests, your teeth will be bad.
· You cannot change your job or apartment. According to the sign, the new place will turn out to be joyless and turbulent.
· If a child is born on a leap year, he must be baptized as quickly as possible, and godparents must be chosen among blood relatives.
· Elderly people should not buy funeral items in advance, as this may hasten death.
· You can’t get a divorce, because in the future you won’t be able to find your happiness.
All life on Earth is determined by its proximity to the Sun and the movement of the planet around it and around its own axis. A year is the time during which our planet flies around the Sun, and a day is the time of a complete revolution around its axis. It is, of course, very convenient for people to plan their affairs by week, to count a certain number of days in a month or year.
Nature is not a machine
But it turns out that during a full revolution around the Sun, the Earth does not rotate around its axis the full number of times. That is, there are not a full number of days in a year. Everyone knows that this happens 365 times and this corresponds to In fact, a little more: 365.25, that is, an extra 6 hours are accumulated in a year, and to be completely precise, an extra 5 hours, 48 minutes and 14 seconds.
Naturally, if this time is not taken into account, then the hours will add up to days, those to months, and after a few hundred years the difference between the generally accepted and astronomical calendar will be several months. This is completely unacceptable for social life: all holidays and memorable dates will be postponed.
Such difficulties were discovered quite a long time ago, even under one of the greatest of them - Gaius Julius Caesar.
Order of Caesar
Emperors in Ancient Rome were revered on a par with the gods, had unlimited power, so they simply remade the calendar with one order, and that’s all.
In Ancient Rome, the whole year was built on the basis of the celebration of Kalends, Nons and Ides (these were the names of the parts of the month). In this case, February was considered the last. Thus, there are 366 days in a leap year, with the extra days in the last month.
After all, it was quite logical to add a day in the last month of the year, in February. Moreover, interestingly, it was not the last day that was added, as it is now, but an additional day before the calendars of the month of March. Thus, February became two twenty-fourths. Leap years were appointed after three years, and the first of them occurred during the lifetime of Caesar Gaius Julius. After his death, the system went a little wrong because the priests made a mistake in their calculations, but over time correct calendar Leap years have been restored.
Nowadays, leap years are considered a little more complicated. And this is due to those few extra minutes that are obtained when introducing a full extra day every four years.
New calendar
The Gregorian calendar, according to which secular society currently lives, was introduced by Pope Gregory at the end of the 16th century. Reason why it was introduced new calendar, is that the previous timing was inaccurate. By adding a day every four years, the Roman ruler did not take into account that the official calendar would be ahead of the generally accepted calendar by 11 minutes and 46 seconds every four years.
At the time of the introduction of the new calendar, the inaccuracy of the Julian calendar was 10 days; over time it increased and is now 14 days. The difference increases every century by about a day. It is especially noticeable on the day of the summer and winter solstice. And since some holidays are counted from these dates, we noticed the difference.
The Gregorian leap year calendar is a little more complex than the Julian calendar.
Structure of the Gregorian calendar
The Gregorian calendar takes into account the difference in the official and astronomical calendars of 5 hours, 48 minutes and 14 seconds, that is, every 100 years one leap year is canceled.
So how do you know which year is a leap year and which is not? Is there a system and algorithm for canceling an extra day? Or is it better to use
For convenience, such an algorithm has actually been introduced. In general, every fourth year is considered a leap year; for convenience, years divisible by four are used. Therefore, if you need to find out whether the year of your grandmother’s birth or the beginning of World War II was a leap year, you just need to find out whether this year is divisible by 4 or not. Thus, 1904 is a leap year, 1908 is also a leap year, but 1917 is not.
The leap year is canceled at the change of centuries, that is, in a year that is a multiple of 100. Thus, 1900 was not a leap year, because it is a multiple of 100, non-leap years are also 1800 and 1700. But an extra day does not accumulate in a century, but in about 123 years, that is, amendments need to be made again. How do you know which year is a leap year? If a year is a multiple of 100 and a multiple of 400, it is considered a leap year. That is, 2000 was a leap year, just like 1600.
The Gregorian calendar with such complex amendments is so accurate that there is extra time left, but we're talking about about seconds. Such seconds are also called leap seconds, so that it is immediately clear what we are talking about. There are two of them per year and they are added on June 30 and December 31 at 23:59:59. These two seconds equalize astronomical and universal time.
What is different about a leap year?
A leap year is one day longer than usual and has 366 days. Previously, back in Roman times, this year there were two days on February 24, but now, of course, the dates are counted differently. This year in February there is one more day than usual, that is 29.
But it is believed that years that have February 29th are unlucky. There is a belief that during leap years the mortality rate increases and various misfortunes occur.
Happy or unhappy?
If you look at the mortality chart in the USSR in the second half of the 20th century and in Russia, you will notice that the most high level noted in 2000. This can be explained by economic crises, low living standards and other problems. Yes, the year 2000 was a leap year (since it is divisible by 400), but is that a rule? 1996 is not a record-breaking year for mortality; in the year preceding it, 1995, the mortality rate was higher.
This figure reached its minimum level in almost half a century during non-leap years, but in 1986 the mortality rate was also low, much lower than, for example, in 1981.
There are many more examples that can be given, but it is already clear that mortality does not increase in “long” years.
If you look at fertility statistics, you also cannot find a clear relationship with the length of the year. The leap years of the 20th century did not confirm the theory of misfortune. Fertility rates both in Russia and in European countries falls evenly. A slight rise was observed only in 1987, and then the birth rate began to grow steadily after 2008.
Maybe a leap year determines some tension in politics or predetermines natural disasters or wars?
Among the dates of the start of hostilities, you can find only one leap year: 1812 - the war with Napoleon. For Russia it ended quite happily, but, of course, it was a serious test in itself. But neither the year of the revolution of 1905 nor 1917 were a leap year. The year the Second World War began (1939) was certainly the most miserable year for all of Europe, but it was not a leap year.
In leap years there were also explosions, but such events as Chernobyl disaster, the tragedy in the Japanese cities of Hiroshima and Nagasaki, volcanic eruptions and other disasters happened in the most ordinary years. The list of leap years in the 20th century does not at all coincide with the mournful list of misfortunes and disasters.
Causes of misfortune
Psychologists believe that all statements about the death of a leap year are nothing more than superstition. If it is confirmed, they talk about it. And if it is not confirmed, they simply forget about it. But the expectation of misfortune in itself can “attract” misfortune. It is not for nothing that exactly what he fears often happens to a person.
One of the saints said: “If you don’t believe in omens, they will not come true.” IN in this case This could not have come at a better time.
Leap year in Hebrew
The traditional Jewish calendar uses lunar months, which last 28 days. As a result, the calendar year according to this system lags behind the astronomical year by 11 days. An additional month of the year is regularly introduced for adjustment. The leap year in the traditional Jewish calendar consists of thirteen months.
Leap years happen more often for Jews: out of nineteen years, only twelve are ordinary, and another seven are leap years. That is, Jews have many more leap years than usual. But, of course, we are talking only about the traditional Jewish calendar, and not about the one according to which the modern state of Israel lives.
Leap year: when is next year
All our contemporaries will no longer face exceptions in counting leap years. Next year, which will not be a leap year, is expected only in 2100, this is unlikely to be relevant for us. So the next leap year can be calculated very simply: the nearest year that is divisible by 4.
2012 was a leap year, 2016 will be a leap year too, 2020 and 2024, 2028 and 2032 will be leap years. It's quite easy to calculate. Of course, it is necessary to know this, but do not let this information frighten you. And in a leap year, wonderful and joyful events happen. For example, people born on February 29th are considered lucky and happy.
For centuries, humanity has created a history that has been passed down from generation to generation. Myths or reality about the leap year that have survived to this day make everyone think about this inexplicable fact.
What is a leap year?
The term "leap year" Latin has a digital value - 2nd/6th. It represents, from a scientific point of view, the fourth year, exceeding standard quantity days (366).
Leap year historical period
During the reign of Yu. Caesar, the Roman calendar had an additional repeated day, with one date (the twenty-fourth of February).
The Romans counted days and years by looking at the Julian Calendar.
In the Julian calendar, every fourth year was considered a leap year, and the last two days of February were on the same date.
After the death of the Roman ruler, the priests deliberately began to call the third year a leap year. There was a shift in the annual time and people, for this reason, lived as many as twelve leap years.
Thanks to the decree of the new emperor in Rome - Augustus Octavian, everything fell into place. It took sixteen whole years to establish the correct “leap time”.
Sixteen centuries later Orthodox Church reintroduced new changes to the calendar.
The head of the Catholic Church, Pope Gregory XIII, made a proposal to calculate the calendar according to new rules. He proposed introducing an additional day in February with a different date (the twenty-ninth of February). On general meeting, before the upcoming Easter, the idea of the head of the Catholic Church was successfully accepted. The Roman calendar had a new chronology. In honor of the ruler of the Catholic Church, it began to be called “Gregorian”.
Modern concept of leap year
It is a well-known fact that a year consists of 365 days. The subsequent fourth year is considered a leap year. It is longer by one day.
In a leap year, February has not twenty-eight days, but twenty-nine, but this phenomenon happens once every four years.
Leap year signs and superstitions
Our Slavic ancestors thought that leap year was a mystical, superstitious year. Probably the reason lies in the distant story of Saint Kasyan.
Saint Kasyan served in the Galilean monastery and was its founder. He became famous through his writing, writing twenty-four essays on the “Interview”, based on a moral, Christian attitude towards faith.
The main flaw in the life of Saint Kasyan was that the date of his birth fell on the last day of February, and even at the end of the year.
According to Slavic belief, the last day of the year was considered the end of a harsh winter. For this reason, the holy monk gained notoriety.
Superstitious Slavs considered the last day of a leap year to be the most difficult. They believed in evil spirits and evil spirits. This is where people's fear of leap years came from.
The signs of a leap year were associated with Saint Kasyan:
- If Kasyan approached the people, the disease attacked them.
- Kasyan was close to the animals - their death was inevitable.
- Wherever Kasyan’s gaze falls, there will be trouble and devastation.
- Kasyanov's year is approaching unsuccessfully - barren.
According to legend, you don’t need to do a lot of things during a leap year, for example:
- Play weddings
- Plan pregnancy, give birth to children
- Create new projects
- Go to the forest to pick mushrooms
- Cut hair
- File for divorce
- Borrow money
- Plant new seeds
- Do renovations indoors
- Purchasing real estate
Leap year approaching modern society causes mixed opinions. One part of society believes in his negative actions, the other does not.
The downside of a leap year:
- Natural disasters
- Disasters
- Military conflicts
- Frequent accidents
- Lost
- Fires
The positive side of a leap year
People born in a leap year are creative and talented. Endowed with bright charisma, strong character, love of life (Julius Caesar, Leonardo da Vinci, Elizabeth Taylor, Paul Gauguin).
Today, leap year is perceived as a year of disasters, wars, and disasters. After all, the most terrible events occurred during this period.
People are susceptible to believing something, and most often it is bad. Leap year is perceived as a time of loss, disappointment, and sadness. Is it so? You only have to ask yourself.
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First a note. Not every 4th year is a leap year. We'll explain why later.
A normal year has 365 days. A leap year has 366 days - a day more, due to the addition of an additional day under the number 29 to the month of February, as a result of which those born on this day experience certain difficulties in celebrating their birthday.
A year is the time it takes for planet Earth to complete one revolution around the Sun in relation to the stars (apparently measured as the interval between two successive passages of the Sun through the vernal equinox).
A day (or often in everyday speech - a day) is the time during which the Earth makes one revolution around its axis. As you know, there are 24 hours in a day.
It turns out that a year does not fit exactly the number of days. There are 365 days, 5 hours, 48 minutes and 45.252 seconds in a year. If a year is taken to be equal to 365 days, then it turns out that the Earth in its orbital movement will not “reach” the point at which the circle “closes”, i.e. to get to it you need to fly in orbit for another 5 hours, 48 minutes and 45.252 seconds. These extra approximately 6 hours over 4 years will just be collected into one additional day, which was introduced into the calendar to eliminate the backlog, receiving every 4th year leap year- a day longer. He did this on January 1, 45 BC. e. Roman dictator Gaius Julius Caesar, and the calendar has since become known as Julian. In fairness, it must be said that Julius Caesar introduced a new calendar only by authority, and, of course, astronomers calculated and proposed it.
The Russian word "leap year" comes from the Latin expression "bis sextus" - "second sixth". The ancient Romans counted the days of the month remaining until the beginning of the next month. So February 24th was the sixth day until the beginning of March. In a leap year, an additional, second (bis sextus) sixth day was inserted between February 24 and February 25. Later this day began to be added to the end of the month, February 29.
So, according to the Julian calendar, every 4th year is a leap year.
But it is easy to notice that 5 hours, 48 minutes and 45.252 seconds are not exactly 6 hours (11 minutes 14 seconds are missing). Of these 11 minutes and 14 seconds, over 128 years, another extra day will “run up.” This was noticed from astronomical observations by the shift of the day of the vernal equinox, relative to which they are calculated church holidays, in particular Easter. By the 16th century the lag was 10 days (today it is 13 days). To eliminate it, Pope Gregory XIII carried out a calendar reform ( Gregorian calendar), according to which not every 4th year was a leap year. Years divisible by one hundred, i.e. ending with two zeros, were not leap years. The only exceptions were years divisible by 400.
So, leap years are years: 1) divisible by 4, but not by 100 (for example, 2016, 2020, 2024),
Note that the Russian Orthodox Church refused to switch to the Gregorian calendar and lives according to the old Julian calendar, which is 13 days behind the Gregorian. If the church continues to refuse to switch to the generally accepted Gregorian calendar, then in a few hundred years the shift will become such that, for example, Christmas will be celebrated in the summer.
