On the morning of January 10, the topic of Chinese New Year's Eve for 5 consecutive years from next year appeared on the hot search. 
The Chinese New Year's Eve of the Lunar Year of the Dragon is February 9, 2024, which is the "last Chinese New Year's Eve in recent years". BecauseFrom 2025 to 2029, Chinese New Year's Eve for five consecutive years will be "the twenty-ninth day of the big year". 
Why does the Chinese New Year's Eve come and go?
It turned out that this was all the moon's "fault".
The Chinese lunar calendar, which calculates the number of days in a month based on the changes in the phases of the moon, is known in astronomy as the "synodic cycle".
The day of "Shuo" is the first day of the new yearOn this day people do not see the moon at all.
The day of "hope" is the fifteenth, which is the moment of the full moon.
Since the relative motion between the Moon, the Earth, and the Sun is not static, the "synodic cycle" can be long and short.
The average length of a synodic month is 2953 days, not a whole number, and the number of days in a month is expressed as an integer, so sometimes it is 29 days in a small month, and sometimes it is 30 days in a large month.
In order to ensure that the first day of the lunar month must be a new month, the arrangement of the large and small months is not fixed, which needs to be determined through observation and scientific calculation.
It is not uncommon for the wax moon to coincide with a small moon, which will appear in about three to five years. 2013, 2016, 2022 and 5 consecutive years from 2025 to 2029 have not had Chinese New Year's Eve. However, since the average length of the synodic months is more than 29 days, the major months occur slightly more often each year than the minor months.
Although Chinese New Year's Eve will "disappear", whether it is the 29th or 30th of the lunar month, the Chinese New Year's Eve as a traditional festival has always been there.