Once in a blue moon

Once in a blue moon

I've always used the saying "once in a blue moon" without knowing what it really is and who I've heard it from. I remember in 6th grade we were on the unit of astronomy and my topic was the Moon. I used "once in a blue moon" proverb while talking to her; my teacher’s eyes lit up and asked me to add what it was on my project. I researched the topic for a bit and learned a few things. Normally, the cycle of the moon occurs to only have one full moon per month. However the "blue moon" can occur, which means there are two full moons in one month. This doesn't happen very often so the term "once in a blue moon" means that it is a very rare moment. This phrase has been used for over 400 years dating back to medieval England. I've said "once in a blue moon" many times whenever I'm talking to someone, now I know a little background information on it and it adds emphasis to what you’re saying.