This is my pic, inadequate though it seems, of tonight's Blue Moon.
I always knew the expression 'Blue Moon', but only recently - well, I am aging, so we are talking within the previous 10 years- learnt the meaning of "Blue Moon" . It is the occurrance of a full moon twice in one calendar month.
I am not sure of the significance or importance of such an occurrance, but it is not as rare as I once thought. But it has become part of everyday vernacular, with the 'once in a Blue Moon' reference used for infrequent happenings.
A wonderful book, with instructions on how to make a Kimono! and instructions on how to tie an Obi- or more- I am unaware of the correct term for the plural Obi.