Question

What does once in a blue moon mean?

Answer 1

I think,to see sometimes only

Answer 2

Hey mate,

For this to happen, you generally need 13 full moons in one calendar year and 13 full moons between successive December solstices. This will next happen in the year 2048, when a monthly Blue Moon falls on January 31, and a seasonal Blue Moon on August 23.

hope this helps you out!