How many years does the calendar cycle?

1, 19 Usually, the lunar calendar and the solar calendar can overlap (but there are also cases where they do not overlap).

What day of the week is inconsistent,

These branches do not coincide.

2. 28 solar calendar weeks overlap (cross-century non-overlapping)

The lunar calendar and the solar calendar are inconsistent.

3,38 is twice as much as 19 and the same as 1.

4,57 is three times that of 19 and the same as 1.

5-year or 60-year trunk-branch coincidence

Inconsistency of yin and yang calendars

The number of weeks is inconsistent

If you want the lunar calendar, the solar calendar, the week and the main branch to completely coincide, it won't work in 5000!

Old calendars can never be used!