What is a fortune-telling leap in July _ How do you count birthdays in July?

What is leap July? How many years does it happen? How to calculate

Why is there a leap month in the lunar calendar? Why does the lunar calendar leap in July this year? The leap month in the lunar calendar is to coordinate the contradiction between the tropic year and the lunar year, so that the changes of months and seasons coincide.

Astronomers have observed and calculated that it takes 365.2422 days in the tropic year (the earth revolves around the sun once), and the average time in the first month of the lunar calendar (the moon once) is 29.5306 days. 1February is 354.3672 days, which is less than the return period 10.88 days. If every 12 lunar month is designated as the lunar year, the weather will be inconsistent with the calendar and the time sequence will be disordered and reversed. For example, the Spring Festival in a certain year of the lunar calendar is a snowy winter, and a strange phenomenon will appear in the hot summer after more than a dozen spring and autumn lunar years.

In order to make the changes of months and seasons more consistent, our ancestors found the scientific method of "leap month" through astronomical observation and calculation. 19 tropic year plus 7 leap months, the difference is only: 6939.6910-6939.5438+08 = 0.0892 (days), which is already.

As for the lunar leap month? It depends on the 24 solar terms in a year. There are 24 solar terms in a year, which is just a traditional saying. Strictly speaking, there are twelve solar terms and twelve neutral terms in a year. Solar terms and neutral qi appear alternately, and the lunar calendar has a fixed neutral qi every month. For example, rain is neutral in January; The vernal equinox is in mid-February; Grain Rain is neutral in March. Because the average number of days between two solar terms or two neutral gases is 365.2422/ 12 = 30.4368, which is nearly one day different from the first month of the lunar calendar. Therefore, the date of the lunar month is delayed by nearly one day every month. If this goes on, it will inevitably lead to the gas in some months falling in the last day or two of this month, so it is likely that there will be no gas next month, but it will happen at the beginning of next month. Because every month has its own fixed neutral atmosphere, then the month without neutral atmosphere is called the leap month of last month. For example, the vernal equinox in two years (mid-February) is on February 30th, and there is only one solar term in Qingming next month, but there is no mid-March in Grain Rain, so 2004 is a leap February. This year's summer (mid-July) is July 30th, and there is only one millennium solar term next month, and there is no autumnal equinox. Only after the July leap is set, the Mid-Autumn Festival is fixed in August, and it can appear in August, so this year is the July leap.