Is there thirty in June every year?

According to the solar calendar, there is thirty in June every year, and according to the lunar calendar, there is not necessarily thirty in June every year.

The lunar calendar also has a big moon and a small moon. The big moon has June 30 and the small moon has June 29, so there is no June 30 every year. In the lunar calendar, the time for the moon to orbit the earth once (29.53059 days) is 1 month, which is the so-called "fixed value" in your question; The lunar calendar is different every year, which means that the moon is not fixed, depending on the new moon and the moon.

Annual policies and leap rules:

The winter solstice must be in the second month (1 1 month). If there is1month from the last winter to the sun and the moon, there will be no leap. If there is 13 months, there will be a leap. The first neutral month after the last winter to the sun and the moon is called leap month, and the next few months are called leap months.

For example, there is 12 months between the winter solstice in Renzi year (2032) and the winter solstice in Guichou year (2033), so there is no leap. If there are 13 months from the winter solstice in the ugly year (2033) to the winter solstice in the Jiayin year (2034), a leap must be set;

The first neutral month after the winter solstice (1 1 month) in the year of guichou (2033) is the next month of that month, so it is designated as leap month, just after 1 1 month, so it is called leap/kloc-0.