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Here are rules for the Chinese Lunar Calendar.
1. Calculations are based on the meridian at longitude 120 deg East.
2. The day of the new moon is the 1st day of a lunar month.
3. In the Chinese lunar calendar year, the eleventh month always has
the December solstice in it.
4. If there are 13 months between two December solstices, the first
month that does not has Zhong Qi is an intercalary month, Run
Yue, in the Chinese lunar calendar.
| Year: |
| The day of the preceding December solstice: | |
| The day of the next December solstice: | |
| The eleventh month of the previous year: | |
| Zheng Yue, The first day of the first month: | |
| The intercalary month |
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