Lunar calendar
From Wikinfo
A lunar calendar is a calendar whose date indicates the moon phase.
This is normally done by having a month which corresponds to a lunation so that the day of month indicates the moon phase.
A lunar calendar may indicate the season as well as the moon phase, as the Hebrew calendar and Chinese calendar do. Such a calendar is a lunisolar calendar. But a lunar calendar need not do so. The Islamic calendar has a year which does not follow the seasons. Such a calendar is a pure lunar calendar.
References
- Adapted from the Wikipedia article, "Lunar_calendar" http://en.wikipedia.org/wiki/Lunar_calendar, used under the GNU Free Documentation License

