Mongolian calendar
Encyclopedia
The Mongol calendar is a lunisolar calendar
Lunisolar calendar
A lunisolar calendar is a calendar in many cultures whose date indicates both the moon phase and the time of the solar year. If the solar year is defined as a tropical year then a lunisolar calendar will give an indication of the season; if it is taken as a sidereal year then the calendar will...

 based on system developed in 1747 by monk Ishbaljir . The Mongol year is composed of either 12 or 13 lunar month
Lunar month
In lunar calendars, a lunar month is the time between two identical syzygies . There are many variations. In Middle-Eastern and European traditions, the month starts when the young crescent moon becomes first visible at evening after conjunction with the Sun one or two days before that evening...

s, each beginning and ending with a new moon
New moon
In astronomical terminology, the new moon is the lunar phase that occurs when the Moon, in its monthly orbital motion around Earth, lies between Earth and the Sun, and is therefore in conjunction with the Sun as seen from Earth...

. A thirteenth month is added every two or three years, so that an average year is equal to the solar year.

The Mongol new year celebration is Tsagaan sar
Tsagaan Sar
Tsagaan Sar , white moon or white month) is the lunisolar New Year festival of the Mongols. Today, Mongols are found in Mongolia, Inner Mongolia, Buryatia and Kalmykia. It is often celebrated around the same time as the Chinese New Year...

 which is celebrated two months after the first new moon
New moon
In astronomical terminology, the new moon is the lunar phase that occurs when the Moon, in its monthly orbital motion around Earth, lies between Earth and the Sun, and is therefore in conjunction with the Sun as seen from Earth...

 following the winter solstice
Winter solstice
Winter solstice may refer to:* Winter solstice, astronomical event* Winter Solstice , former band* Winter Solstice: North , seasonal songs* Winter Solstice , 2005 American film...

.

The European system of chronology is called (chronology of method) and the Mongol system of chronology is called (chronology of wisdom).
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