The Farmers' Almanac defined blue moon as an extra full moon that occurred in a season; one season was normally three full moons. If a season had four full moons, then the third full moon was named a blue moon.
A "blue moon" is also used colloquially to mean "a rare event", reflected in the phrase "once in a blue moon".
And I do believe Mr. Neil Armstrong's funeral is scheduled for this day...
Blue Moon ~ The Marcels
| I remember finding out about you|
Every day my mind is all around you