The Blue Moon phenomenon occurs__________
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) - when two full moons occur in the same month.
A blue moon is the second full moon in a calendar month, and the period from one full moon to another is about 29 1/2 days. So, when two full moons occur in the same month, the first one is always on the first or second day of the month and the second one is on the 30th or 31st day.