Why is there a July and a run of July?

To put it simply, the year of the lunar calendar is not 365 or 366 days, so in order not to celebrate the Spring Festival in the summer, a leap month is used.

The year of the Gregorian calendar is when the earth circles the sun, and the first month of the lunar calendar is the moon around the earth once (a month lacks a full moon, and the sunrise and sunset and moonrise and moon set are all formed due to the rotation of the earth). In this way, the change of seasons takes the lunar months to complete, so in general, there is a leap month every other year.

Q: Why is there a leap July this year?

Answer: The Year of the Dog will have 13 months with a total of 385 days, and the month of repetition - July is called the Leap Seventh Month. Why Leap July?

In order to keep the lunar calendar in sync with the return year of the Gregorian calendar (solar calendar), the ancients used the method of setting leap months to solve the problem.

The ancient calendar has 24 solar terms, which are divided into solar terms and middle terms. The lunar calendar is the second day of the month. The beginning of the month is called the solar term, and the middle of the month is called the middle of the month, "for example, the beginning of spring is the first month of the solar term, and the rain is the middle of the first month." ”

The average length of the two solar terms in the Gregorian calendar is days, and there are only one day in each month of the lunar calendar, a difference of 1 day. As a result, the monthly mid-air will be 1-2 days later than the previous month. If this continues, there will always be a month with only solar terms and no middle terms.

The month without mid-air is designated by the calendar as a "leap month" and is called a "leap month". This year, the leap month is after July, which is the leap July.

Why is there no leap month? This is because the Earth's orbit around the Sun is an ellipse, and the Sun is at one of the focal points of the ellipse. Over the course of a year, the distance between the Earth and the Sun has been close and far.

When the earth is far away from the sun, it is around June of the Gregorian calendar, and the movement is slow, so the interval between the two mid-air is long, the longest is more than 31 days. Based on the length of the previous average days, there is a high probability that there is no mid-air in the month, and a leap month is more likely. Therefore, there are many opportunities in leap April, leap May, and leap June.

Around December of the Gregorian calendar, the earth moves fast, and the interval between the mid-air is short, and the shortest time is only a little more than 29 days, which is shorter than a month in the lunar calendar, so it is unlikely that there will be no mid-air in the first month, November, and wax month in the first month, November, and wax month. In contrast, there are fewer chances of leap months.

The calendar of the lunar calendar stipulates that there will often be a running moon.

This is an algorithm of the Chinese lunar calendar...

There are leap years, and there are leap months...

This leap July will not occur once in 38 years...

This is an algorithm of the Chinese lunar calendar...

Leap July generally occurs once every 19 years (e.g., 1949, 1968) and sometimes every 38 years (e.g., 2006, 2044).

Others occur once in more than 19 years but not more than 38 years (e.g., 2226, 2253, 27 years apart, 3399, 3429, 30 years apart), and once every 8 years (e.g., 2541, 2549) or 11 years (e.g., 2253, 2264).

Leap July is a term in the lunar calendar, and in order to keep the lunar calendar in sync with the return year of the Gregorian calendar (solar calendar), the ancients used the method of setting leap months to solve it.

Leap July is a saying in the lunar calendar, in order to keep the return year of the lunar calendar and the Gregorian calendar (solar calendar) synchronized, the ancients in China used the method of setting a leap month to solve, and leap July is a more common leap month, its probability of occurrence is second only to leap April, leap May and leap June.

The year in which the leap July appears.

1672, 1691, 1699, 1710, 1729, 1748, 1767, 1786, 1824, 1843, 1854

1881, 1919, 1938, 1949, 1968, 2006, 2044, 2063, 2082, 2101, 2120

2139, 2158, 2177, 2196, 2215, 2226, 2253, 2264, 2291, 2310, 2321

2340, 2359, 2378, 2416, 2435, 2446, 2473, 2492, 2511, 2530, 2541

2549, 2560, 2568, 2587, 2598, 2636, 2655, 2663, 2674, 2682, 2693

2712, 2731, 2750, 2769, 2788, 2807, 2818, 2856, 2864, 2883, 2902

2913, 2932, 2951, 2970, 3008, 3027, 3038, 3046, 3065, 3084, 3103,

3122, 3141, 3160, 3179, 3190, 3228, 3274, 3285, 3304, 3323, 3342

3361, 3380, 3399, 3429, 3448, 3456, 3475, 3494, 3505, 3524, 3543.

Why is it not indicated after 3543.

That is, there are two July months in the lunar calendar.

According to the lunar calendar, Runyue means that there are two identical months in the year, and Runqi means that there are two Julys in 2006 and RunFebruary is the same concept.

Why is there a leap 7th month in the lunar calendar this year?

Why does the lunar calendar have leap months? Why is there a leap 7th month in the lunar calendar this year? ——The leap month in the lunar calendar is to reconcile the contradiction between the return year and the lunar year, so that the changes of the months and seasons can be more consistent.

Astronomers have observed and calculated that the time of the return year (one revolution of the Earth around the Sun) is the day, and the average time of the synodic month (a cycle of the Moon) is the day. The 12 synodic months are the days, which are fewer days than the return year.

If every 12 synodic months are set as a lunar year, there will be a disagreement between the time of day and the calendar, and the time sequence will be reversed. For example, the Spring Festival of a certain year of the lunar calendar is a cold winter with heavy snow, and after more than a dozen spring and autumn lunar years, it will appear in the scorching summer of the red sun.

In order to make the changes of the months and seasons more consistent, our ancestors through astronomical observation and calculation, found out the scientific "leap month" method, in the 19 return years after adding 7 leap months, only the difference: days), which is already accurate enough, so the current lunar calendar uses the seventeen-year seven leap method.

As for which month is the leap month in the lunar calendar? It is decided on the 24 solar terms of the year. It is just a traditional way to say that there are 24 solar terms in a year, strictly speaking, there are 12 solar terms and 12 middle terms in a year.

The solar terms and the mid-air alternate, and there is a fixed mid-air in each month of the lunar calendar, such as rain is the mid-air in January; The vernal equinox is the mid-air of February; Gu Yu is the ...... of the middle air in March. Since the average number of days between the two solar terms or the two solar terms is a day, there is a difference of nearly one day from the synodic month. As a result, the date of Zhongqi in the lunar month will be delayed by almost one day from month to month.

If this continues, there will inevitably be a month in which the mid-air will fall on the last two days of the month, and then it is likely that there will be no mid-air in the next month, but at the beginning of the next month. Since each month has its own fixed neutral air, then, the month without neutral air is called the leap month of the previous month. For example, the spring equinox in 2004 (the middle of February) is February 30, and the next month only has a solar term in Qingming, and there is no Guyu in March, so 2004 is a leap February.

This year's summer (mid-July) is July 30, and there is only one solar term in Bailu in the next month, and there is no mid-solar term of the autumnal equinox, and only after the setting of leap July, the autumnal equinox, the fixed mid-air of August, can appear in August, so this year's leap July.