Ecclesiastical full moon century AD computists of some churches, among which were the Church of Rome and the one of Alexandria, had begun to calculate their own periodic sequences of dates of paschal full moon, to be able to determine their own dates of Easter Sunday. The motivation for these experiments was a dissatisfaction with the Jewish calendars that Christians had hitherto relied on to fix the date of Easter. These Jewish calendars, according to their Christian critics, sometimes placed Nisan 14, the paschal full moon and the day of preparation for the Jewish Passover, before the spring equinox (see Easter). The Christians
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