Blue Moon

July 31st full moon tonight and there was one on the first of the month. Two in one month makes it blue. It's not blue but it's big and bright and it's here in Bali. but is it a blue moon there? Yep - see it in news from the US. There is another definition of a blue moon that it's the 3rd of four full moons in a season but this is the type I notice and can comprehend. Why blue?

Katrinka just took this photo of it above our humble abode.