Thursday, March 6, 2025

Question: How often does a blue moon occur?

Answer: A blue moon could refer to either a monthly blue moon, which is when two full moons are seen in the same month, or a seasonal blue moon, which is the third full moon in an astronomical season with four full moons. Either type of blue moon occurs roughly every two to three years. Neither is actually blue in color, though the moon can sometimes appear blue due to an unrelated atmospheric effect caused by volcanic eruptions.