# blue moon

> extra 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

**Wikidata**: [Q328327](https://www.wikidata.org/wiki/Q328327)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Blue_moon)  
**Source**: https://4ort.xyz/entity/blue-moon-q328327-2


## References

1. Freebase Data Dumps. 2013
2. BBC Things
3. Quora