It seems to be a reference to priests at the time making statements and expecting the average person to trust they were right, irrespective of how ridiculous it was. “O churche men are wyly foxes Yf they say the mone is blewe / We must beleve that it is true / Admittynge their interpretacion.” The earliest known recorded use of another version of the idiom is in an anti-clerical booklet printed in 1528 by William Roy and Jeremy Barlowe. Apart from that, sometime the full moon appears to be different in colour specially blue and orange and bigger in size.

The concept behind the origination of this idiom is second but rare appearance of the full moon in same month. Blue moon is the full moon that appears second time in same calendar month and this phenomenon happens only once in 32 months. Although I trust in God, I visit that famous temple only once in a blue moon.My Dad is working in Scotland and he visits home once in a blue moon, every couple of years.

“I think my grandson doesn’t love me anymore, he comes to see me only once in a blue moon.”.

I don’t know why she bought that music system – she uses it once in a blue moon.

The earthquakes hits once in a blue moon in this part of the earth, we never felt it.

How to use eclipse in a sentence