What Is a Lunar Cycle Month
A lunar cycle month is the time it takes for the Moon to complete all its phases and return to the same position relative to the Sun. It is also called a synodic month.
How Long Is a Lunar Month
A lunar cycle month lasts about 29.5 days on average. Because it is shorter than a calendar month, lunar months shift earlier each year against the solar calendar.
Why the Lunar Month Matters
Lunar months are the basis for many calendars, including the Islamic calendar, and they affect cultural events, agriculture, and some financial planning tied to seasonal cycles.
For precise data on lunar phases and cycles, see U.S. Naval Observatory Astronomical Applications.
