Q. The blue moon phenomenon occurs

A
When two full moons occur in the same month
B
When four full moons appear in two consecutive months of the same calendar year
C
When two full moons appear in the same month thrice in a calendar year
D
None of the above
Solution:

A blue moon is an additional full moon that appears in a subdivision of a year: either the third of four full moons in a season or a second full moon in a month of the common calendar.

The phrase has nothing to do with the actual colour of the moon, although a literal “blue moon” may occur in certain atmospheric conditions: e.g., if volcanic eruptions or fires leave particles in the atmosphere of just the right size to preferentially scatter red light.

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