There’s something everyone does once in a blue moon. If you take that idiom literally, Friday was the day to do what you do occasionally.

Thousands on Friday enjoyed watching the “blue moon”, the name for a full moon when it appears twice in a month.

“It is a normal full moon, except for the fact that it occurs twice in a month,” says C. B. Devgan of the Science Popularisation Association Communicators & Educators (SPACE).

“The special thing about it is that it’s just once in two or two-and-a-half years that a full moon appears twice in a month,” he says.

“It is exciting, though the moon looks the same. The fact that this is the blue moon makes it special,” says Devika, a student.

However, the blue moon is not blue in colour unless there is volcanic ash in the atmosphere.

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