What is the difference between a black moon and a blue moon?

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Tags

1. #definitions
2. #expect
3. #which
4. #sometimes
5. #month
6. #usually
7. #refer
8. #third
9. #partial
10. #refers
11. #explanation
12. #black
13. #instead
14. #season
15. #color
16. #berman
17. #might
18. #called
19. #second