W. M. Keck Observatory’s Post

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LOOK UP: Tonight! A rare, super blue moon will rise in the night sky - but it doesn’t have to do with color 🤔 Rather, “blue moon” refers to the frequency of full moons. There are two types of blue moons: 1) seasonal, the third full moon in a season with four full moons (instead of the usual three); and 2) monthly, the second full moon in a calendar month. Tonight is Summer’s seasonal blue moon. It’s also a “supermoon”, which occurs when a full moon coincides with the Moon’s closest approach to Earth in its orbit, making the Moon appear slightly larger and brighter! 👉 https://bit.ly/46JsIfE 📸 Creative Commons 

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