Large in the sky and perfectly round, Monday night’s super blue moon is an attention-getter. But how rare, really, is it? It is unusual because it’s both blue and super. According to NASA ...

Just exactly when is the next Supermoon Blue Moon? As we ready ourselves for the Supermoon Blue Moon on Monday, Aug. 19 where it officially becomes 100% full at 2:26 p.m. EDT (1826 GMT).

But it’s a special instance, because Sunday’s supermoon is also a seasonal blue moon — the third full moon in a season of four. The full moon will appear larger and brighter than usual.

August's full moon, which is coming Monday, August 19, has several names. It's a supermoon, a blue moon and the sturgeon moon. So what do they all mean? The "super" part refers to the moon's orbit ...