Here's why:
* The Lunar Cycle: The lunar cycle, from new moon to full moon and back again, takes approximately 29.5 days.
* Monthly Variations: While the length of a month varies slightly depending on the calendar, it's always longer than the lunar cycle.
* Full Moons Are Guaranteed: This means that at least one full moon will always occur within each calendar month.
Therefore, it's impossible for a month to pass without a full moon.
