Here's the full Moon calendar for May 2025 so you can plan your late-night sky sessions accordingly: Waxing Crescent: May 1–3 ...

Blue moon is either the second full moon in a calendar month or the third in an astronomical season with four full moons. The ...

Only when the moon, Earth and the sun are perfectly aligned is the moon 100% full. And sometimes — once in a blue moon — the moon is full twice in a month (or four times in a season ...

A monthly blue moon is the second full moon within one calendar month. We see a blue moon about once every three years, on average, according to NASA. The moon will meet both the seasonal and ...

The second is a monthly blue moon, which refers to the second full moon in a calendar month with two full moons. The two definitions are now used interchangeably as alternative understandings.