A “blue supermoon,” will rise in the night sky on Wednesday, August 30, LiveScience reported this week.

The expression, “once in a blue moon” has relevance in a real lunar phenomenon. Moreover, as the phrase suggests, they are indeed rare, and the lunar event to take place on Wednesday will not be seen again for some years.

The name, though, is somewhat misleading as the blue moon is not actually blue. The moon will actually appear to have an orange hue.

There are, in fact, two varieties of blue moons, LiveScience explains. The first type, a “calendar blue moon” occurs when two full moons occur within the same month. As a full moon appears every 29.5 days, although rare, it necessarily occurs every two or three years.... Read More: JPost