Herong's Notes on Astrology and Horoscope - Version 2.11, by Dr. Herong Yang
Chinese Lunar Month System
This section describes how months are counted in Chinese calendar.
In Chinese calendar, months are lunar months. This means the first day of each month beginning at midnight is the day of the astronomical new moon.
Because new Moon happens every 29.53 days, the number of days in a month is changing between 29 days and 30 days.
In order to synchronize with the tropical year, an extra month, leap month, will be inserted. The exact rule of how the leap month should be inserted is very complex. You can read more details on my other book "Herong's Notes on Chinese Calendar"
Chinese lunar months are named as:
1st month 正月 zhengyue 2nd month 二月 eryue 3rd month 三月 sanyue 4th month 四月 siyue 5th month 五月 wuyue 6th month 六月 liuyue 7th month 七月 qiyue 8th month 八月 bayue 9th month 九月 jiuque 10th month 十月 shiyue 11th month 冬月 dongyue 12th month 腊月 nayue
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