星空有约丨今年七夕节，本世纪最晚！

Group 1 - The Qixi Festival, a traditional Chinese holiday, is set to occur on August 29 this year, making it the latest occurrence in the 21st century [6] - The festival's date varies each year due to the lunar calendar, which can result in it falling anywhere between July 31 and August 30 [6] - The lunar calendar is a lunisolar calendar that accounts for both the moon's cycles and the sun's cycles, leading to the need for intercalary months to align the lunar year with the solar year [3] Group 2 - This year, the lunar year is a leap year with an extra month, causing some festivals, including Qixi, to be delayed [6] - The latest Qixi Festival in the 21st century will occur this year, with another occurrence expected in 2055 [6] - The earliest Qixi Festival in this century was in 2006, with future early occurrences projected for 2044 and 2082 [6] Group 3 - The Qixi Festival is celebrated with various customs such as skill praying, book drying, and moon worship, emphasizing its romantic theme [8] - The festival is an opportunity for people to experience the unique charm of traditional holidays [8]