While the moon has four primary phases each month ... This means that one lunar rotation on its axis corresponds to the time of revolution around Earth, equal to 29.5 days. On a daily basis ...

And sometimes — once in a blue moon — the moon is full twice in a month (or four times in a season ... venture whether it be exploring the lunar seas, mountainous terrain, or the many craters ...

A lunar month is the period of time from one new moon to the next — about 29.5 days — so the lunar calendar doesn't precisely align with the common one where most months span 30 or 31 days.