Why is July and August a big month every year?

In 46 BC, the Roman emperor Julius Caesar revised the calendar, stipulating that there are 12 months and 365 days every year, and a leap year is set every four years. Because Julius Caesar was born in July, he stipulated that July was a big month with 3 1 day to show his dignity. Thus, it is stipulated that a single month is 3 1 day and two months are 30 days.

There are 3 1 day in six months and 30 days in six months every year, so there are 366 days in a year, one more day than 365 days, so we must try to subtract one day from the whole year. At that time, according to Roman custom, February was punishment month, and all criminals were executed in February. It was an unlucky month. Everyone hoped that February would pass faster, so they deleted one day from the middle of February and changed it into 29 days.

Later, Augusto, Caesar's nephew, became the Roman emperor. In order to show the same dignity as Julius Caesar, he changed the August of his birth to 3 1 day, and changed the months of 9, 10,16,5438+0 and 12. One day is added in August and one day is subtracted from the unlucky February, so February has only 28 days. Leap year has only 29 days.

The origin of the month

The legend of the origin of the moon comes from the "immortal moon" in Shan Hai Jing. According to Shan Hai Jing, the emperor had two wives, namely He Chang. On his birthday, Chang 'e gave birth to the moon, so Chang 'e is also called the mother of the moon.

In fact, and often are calendar office. It is recorded in Shiben that in order to make a calendar, the Yellow Emperor formulated "xi He Zhan Ri, Changyi Zhan Yue", Changyi is Chang, and Zhanyue is the twilight period for observing the moon, which is the origin of "Chang Sheng was born in December".