A Lunar calendar s one that is based on moon cycles, such as a crescent or full moon. In lunar calendars, a lunar month is the time between two identical new moons and full moons. A lunar month ts divided into two phases which are first waning moon to fifteenth waning moon and first waning moon to fourteenth waning moon in odd number months January, March, May, July, September and November) and first waning moon to fifteenth waning moon in even number months February, April, June, August, october and December). December the first lunar month while November is the last.