De revolutionibus orbium coelestium have begun work on his new system by that time. Most historians believe that he wrote the "Commentariolus" after his return from Italy, possibly only after 1510. At this time, Copernicus anticipated that he could reconcile the motion of the Earth with the perceived motions of the planets easily, with fewer motions than were necessary in the "Alfonsine Tables", the version of the Ptolemaic system current at the time. In particular, the heliocentric Copernican model made use of the Urdi Lemma developed in the 13th century by Mu'ayyad al-Din al-'Urdi, the first of the Maragha astronomers to develop a non-Ptolemaic
The Line of the Sun or American literature, which Socolovsky states can be a "common trope for understanding U.S. multicultural writers." The Line of the Sun The Line of the Sun, also titled "La Línea del Sol" in the Spanish translation, is a 1989 novel written by Puerto Rican-American author Judith Ortiz Cofer. The novel was originally published in English and tells the story of a Puerto Rican family who emigrates to the United States. The story depicts the cultural, social, and personal struggles of the family members to maintain their native culture in Puerto Rico and their new way of life in both the