Blue Moon

Tomorrow is a blue moon. We currently call a second full moon in a month a Blue Moon, but that is a mistake.

From what I can tell it's originally related to the other dead metaphor, the moon being made of green cheese. Green meant new, not the color per se. The pale white moon at certain times of the year looks like freshly made cheese. Later, when the moon is high in the sky and "aged" it is compared to "Bleu" cheese; cheese that has aged (and grown mold). Tells us more about the busy cheese-makers than the moon...

Then it later meant the third full moon in a quarter with four full moons. This meaning was lost (used in old Farmer's Almanacs) until Sky and Telescope magazine misinterpreted the meaning for a quiz in their magazine in the 1940's. They later (decades) retracted this mistake but it was too late. Popular culture, especially music, had endorsed this new meaning.

Harvest, Hunters, and Blood moon refer to the full moons late in the year which rise around sunset and are visible most of the night, giving farmers and hunters light for their nocturnal activities.

Black moon is a month (only February) without any full moon.