De revolutionibus orbium coelestium De revolutionibus orbium coelestium De revolutionibus orbium coelestium ("On the Revolutions of the Heavenly Spheres") is the seminal work on the heliocentric theory of the Renaissance astronomer Nicolaus Copernicus (1473–1543). The book, first printed in 1543 in Nuremberg, Holy Roman Empire, offered an alternative model of the universe to Ptolemy's geocentric system, which had been widely accepted since ancient times. Copernicus initially outlined his system in a short, untitled, anonymous manuscript that he distributed to several friends, referred to as the "Commentariolus". A physician's library list dating to 1514 includes a manuscript whose description matches the "Commentariolus", so Copernicus must
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