Chinese Calendar based on Lunar Calendar

All Chinese refer their birthdays to the Chinese Lunar Calendar.
As the word `Lunar' suggests, it can also be called the Chinese MOON Calendar.
It is easy to know when is the start of each month or the start of Chinese New Year.
For example, Chinese New Year is when if you peer towards the sky (in a clear day) and when there is a FULL MOON, it is more likely either the 15th of the Lunar Month or the First day of a new Chinese Month.
This is also the rationale why there are 15 DAYS in a CHINESE NEW YEAR.