Is the perpetual calendar accurate? I found that this was not allowed.

Classification: Life; Life common sense

Problem description:

It's a fact!

Analysis:

I checked that it was June 23 of the lunar calendar.

This is also normal, because the "first day" of the lunar calendar every month includes the time of "new moon", which means that the visibility of the lunar surface from the earth will be the lowest on the first day of the lunar calendar every year. Therefore, people who make calendars will try their best to know the time of the "new moon", some by calculation and some by the observatory. Because of their different calculation methods, errors will occur.

As for this question, it depends on the last month of the lunar calendar (May), that is, June and July of 1996. In the June and July dates of 1996, the new moon is at 9: 35 on June 16 and at 0: 34 on July 16. So in these two days, from June 16 to July 16 is exactly 30 days, so May of the lunar calendar is a big month. (The time of the new moon is taken from the Solar Shuttle Calendar, an authoritative calendar program.)

If the new moon starts at 0: 34 on July 1996, then July 16 is the first day of June and July 15 is the 30th day of May. Because the new moon starts at 0: 34, it is easy to make mistakes. If someone calculates July 15 at 23: 34, in this way, May of the lunar calendar becomes a small moon, and July 15 is the first day of June. Of course, the date will be advanced by one day, so that the 23rd day of the lunar calendar will become the 24th day of the lunar calendar.

It can be seen that the problem lies in the date1July 996 15.