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About Blue Moon
A Blue Moon is the rare second full moon in a single calendar month (or the third of four in an astronomical season). Despite the name, the moon does not actually appear blue — the phrase gave rise to the expression once in a blue moon, meaning extremely infrequent.
When is Blue Moon in other years?
The following is a list of dates of when Blue Moon will happen in the future, and past dates.
Future Blue Moon dates
| Event | Date | Link |
|---|---|---|
| Blue Moon May 2027 | Countdown | |
| Blue Moon August 2028 | Countdown |
Past Blue Moon dates
| Event | Date | Link |
|---|---|---|
| Blue Moon May 2026 | Countdown |