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Because it takes a while for the moon to fully orbit the earth. Then, it has to be exactly 90 degrees toward the sun and that doesn't happen very often. But when the moon is fully orbited around the sun and exactly 90 degrees towards the sun, we get a blue moon.

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14y ago

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What famous sayings or things contain the word blue?

"Feeling blue" typically means feeling sad or melancholy. Additionally, "blue moon" refers to a rare event, as in the saying "once in a blue moon." Also, "out of the blue" means something unexpected or sudden.


Is a blue moon rare?

Yes.


Is once in a blue moon a metaphor?

No, "once in a blue moon" is an idiom or expression that means something that happens very rarely. It refers to the occurrence of a full moon twice in one calendar month, which is rare and considered a special event.


Is it more rare to have a 'perigee moon' or blue moon?

both are equally rare, you should know that


Does blue moon mean rare?

yes


What is the origin of the expression Once in a blue moon?

The expression "once in a blue moon" originates from the occurrence of a rare event. A blue moon refers to the second full moon in a calendar month, which happens infrequently, approximately every two to three years. Thus, the phrase signifies something that happens very rarely.


Is the blue moon the first full moon within one calendar month?

No, the blue moon is actually the second full moon in a calendar month. It is a rare event that occurs when there are two full moons within the same month.


When does a blue moon happen?

A blue moon is any full moon that happens to be the second full moon in a calendar month. Therefore blue moons invariably happen near the end of a month. As the lunar cycle is just about 28 days, it would be a very rare occurrence for one to happen at the end of February, but otherwise they are a natural phenomenon.


When was the rare super blue blood moon event last observed?

Oh, isn't that a magnificent event to witness! The last rare super blue blood moon occurred on January 31, 2018. Nature all around us is able to treat us to such incredible displays of beauty and wonder from time to time. Keep your eyes open, my friend, you never know what magic might unfold in the sky next!


Why is it not possible to see the moon in daytime?

It IS possible to see the moon in the daytime, and it is not a rare event.


The definition of the expression once in a blue moon is...?

Seldom; very rarelyType your answer here...


Why do you use the expression once in the blue moon to mean very rare?

have you ever seen a blue moon? thats why