Lunar calendar, of course. Tanabata is calculated according to ancient times. There was no solar calendar in ancient times. China's July 7th is the day when the Cowherd and the Weaver Girl meet, which is in the lunar calendar, so China's Qixi Valentine's Day is of course calculated according to the lunar calendar.

Valentine's Day in China, also known as Jochey's Day, Jochey's Day or Chinese Valentine's Day, originated in China. It is a traditional festival in China and some East Asian countries influenced by Chinese culture. On the night of the seventh or sixth day of the seventh lunar month, women beg for wisdom from Vega in the yard, so it is called "Qiao Qi".

Valentine's Day on Qixi originated from the worship of nature and women's embroidery, and was later given the legend of cowherd and weaver girl, making it a festival symbolizing love.

On a clear summer and autumn night, the sky is full of stars, and a white galaxy spans the north and south like a bridge. On the east and west banks of the river, there is a shining star across the river, that is Altair and Vega.