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
Heroes of the Equinox will confront material forces, the second monsters from the animal kingdom and on the third traps of the spirit. Laureline asks what happens after the third day, she is told that nobody knows since those who succeed never return – children in their image arrive in vessels pushed by the last wave of the equinox. Just then all four champions fly away from Simlane towards Filene. Reaching Filene, each champion chooses a different route to follow to the summit of the mountain. Valérian is challenged by rockfalls and narrow crevices, Irmgaal by stifling mists and lava flows, Ortzog by deadly