De revolutionibus orbium coelestium Earth's axis rigidly to a Sun-centered sphere. The unfortunate consequence was that the terrestrial rotation axis then maintained the same inclination with respect to the Sun as the sphere turned, eliminating the seasons." To explain the seasons, he had to propose a third motion, "an annual contrary conical sweep of the terrestrial axis". It was not until the Great Comet of 1577, which moved as if there were no spheres to crash through, that the idea was challenged. In 1609, Kepler fixed Copernicus' theory by stating that the planets orbit the sun not in circles, but ellipses. Only after Kepler's
Canticle of the Sun Kõrvits (1969) composed a 12-part "A cappella" piece for mixed choir (SSAATTBB) "The Canticle of the Sun" for Southern Chorale choir in 2014. Pope Francis published his second encyclical Laudato si' on June 18, 2015. The Canticle inspired the encyclical's title, "Praise be to you," and was quoted in the first paragraph, "Praise be to you, Our Lord, through our Sister, Mother Earth, who sustains and governs us, and who produces various fruits, with colored flowers and herbs." The Irish composer Vincent Kennedy was commissioned by the Irish Franciscans to set the Canticle of the Sun for Soprano, Harp and