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The lunar calendar, also known as the perpetual calendar, is a calendar based on the phases of the moon.
Single calendar type.
In fact, the lunar calendar is the Islamic calendar, in which each year only contains exactly 12 lunar months.
The characteristic of a purely lunar calendar, as in the case of the Islamic calendar, is that it is a continuum of the full moon cycle and is completely unrelated to the seasons.
Thus, the Islamic lunar year is shorter than each solar year by 11 or 12 days, and only reverts back into alignment with the solar year every 33 or 34 Islamic years.
The Islamic calendar is used mainly for religious beliefs purposes.
In Saudi Arabia the calendar is also used for commercial purposes.
Most other calendars, whether called "lunar" or perpetual calendars, are in fact the lunisolar calendar.
This means that in those types of calendars, the months are maintained according to the cycles of the Moon, but sometimes leap months are added according to certain rules to adjust the moon phases for alignment.
back to the calendar year.
Currently, in Vietnamese, when it comes to the lunar calendar, people think of the type of calendar that is based on the bases and principles of the Chinese calendar, but has been modified according to UTC+7 instead of UTC+8.
It is a literal lunisolar type, not a pure lunar calendar.
Because the calculation of the lunar calendar is different from that of China, the Lunar New Year of the Vietnamese people sometimes does not completely coincide with the Spring Festival of the Chinese and other countries influenced by Chinese culture and the Han character culture.
other.
Since the pure lunar calendar has only 12 lunar months (conjunction months) in each year, this cycle (354,367 days) is also sometimes referred to as a lunar year.
Lunar calendar
The lunisolar calendar is a calendar used by many cultures, in which the dates of the calendar indicate both the lunar phase (or moon phase) and the time of the solar year (solar calendar).
If the solar year is defined as a tropical year, the lunisolar calendar will provide an indication of the seasons; if it is in sidereal years, the calendar will predict the constellation in which the full moon (eclipse) may occur.
Usually there is an additional requirement that a year contains only a natural number of months, in most years 12 months but every 2 (or 3) years there is a year with 13 months.
Features:
Today's lunar calendar
see good and bad days
Zodiac Hour
Hour of Darkness
Cavalry Days
Five Elements
Peng Zu Baiji Japan
Khong Minh Luc Dieu
The Twenty-Four Eight Stars of Spades
The Twelve Views Excluding DIRECTLY
Jade Box Thong Thu
Departure direction
Departure time According to Ly Thuan Phong

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