Full moon is called a blue moon. The term "blue moon" used in this sense may date to as early as the 16th century, but it became well known in the United States due to the "Farmers' Almanac" (published since 1818). According to the "Farmers' Almanac", a "blue moon" is the third full moon in any period between either solstice and equinox, or between equinox and solstice, (calculated using the mean tropical year), which contains four full moons. These seasons are equal in length, unlike the astronomical ones, which vary in length depending on the Earth's speed in its elliptical orbit round
From the Earth to the Moon problem of surviving the incredible acceleration that the explosion would cause. Ardan suggests that Barbicane and Nicholl travel with him in the projectile, and the offer is accepted. In the end, the projectile is successfully launched, but the destinies of the three astronauts are left inconclusive. The sequel, "Around the Moon", deals with what happens to the three men in their travel from the earth to the moon. The novel was adapted as the opera "Le voyage dans la lune" in 1875, with music by Jacques Offenbach. In 1880 the Pall Mall Gazette described Verne’s "Columbiad" as a ‘space-ship’ -