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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 predict the constellation near which the full moon may occur. As with all calendars which divide the year into months there is an additional requirement that the year have a whole number of months. In this case ordinary years consist of twelve months but every second or third year is an embolismic year, which adds a thirteenth intercalary, embolismic, or leap month.
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In case of usage different from personal, you must give the following attribution:
Gregory H. Revera - GHRevera

See also

image of Full moon partially obscured by atmosphere
Full moon partially obscured by atmosphere
image of MODIS Map
image of Earthrise  
image of The Blue Marble  
The Blue Marble  
image of Neptune Full
Neptune Full