Why did you find that the hair on the magpie's neck fell off a few days after Tanabata?

Tanabata, formerly known as the Begging Festival. Qixi Qiqiao originated in the Han Dynasty. Ge Hong's Miscellaneous Notes on Xijing in the Eastern Jin Dynasty records that "women in the Han Dynasty often wear seven-hole needles on July 7 in the building, and everyone wears them", which is the earliest record of begging for cleverness in ancient literature we have seen. Photochina's Valentine's Day with cows and women on stone reliefs in Han Dynasty originated from people's worship of nature. According to historical documents, at least three or four thousand years ago, with people's understanding of astronomy and the emergence of textile technology, there was a record of Altair Vega. People worship the stars far more than Altair and Vega. They think that there are seven stars representing directions in the east, west, north and south, which are collectively called 28 nights, among which the Big Dipper is the brightest and can be used to tell directions at night. The first star of the Big Dipper is called Kuixing, also known as the champion. Later, with the imperial examination system, the top scholar in the middle school was called "Dakui Scholar in the World", and the scholars called Tanabata "Kuixing Festival" or "Book-drying Festival", which preserved the trace that the earliest Tanabata originated from worshipping stars. Qixi also comes from the ancient people's worship of time. "Seven" and "period" are homophonic, and both the month and the day are "seven", giving people a sense of time. In ancient China, the sun and moon, together with the five planets of water, fire, wood, gold and earth, were called "Seven Obsidian". Seven figures are staged in time among the people, and the calculation of time often ends with "July 7th". In old Beijing, when doing Dojo for the dead, it was often done by "July 7th". Using "seven obsidians" to calculate the current "week" is still reserved in Japanese. "Seven" and "Auspicious" are homophonic, and "July 7th" has a double auspicious meaning, which is an auspicious day. In Taiwan Province Province, July is called "Joy brings good luck" month. Because the happy character in cursive script looks like "seventy-seven", 77 years old is also called "Happy Birthday". Tanabata is also a phenomenon of digital worship. In ancient times, people listed the seventh day of the first month, the third day of March, the fifth day of May, the seventh day of July and the ninth day of September as auspicious days, plus the even number of February 2 and the multiple of June 6. "Seven" is the number of beads in each column of the abacus, which is romantic and rigorous, giving people a mysterious aesthetic feeling. "Seven" and "wife" are homophonic, so Qixi has largely become a festival related to women.