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A volvelle from a sixteenth-century edition of Sacrobosco's De Sphaera. De sphaera mundi (Latin title meaning On the Sphere of the World, sometimes rendered The Sphere of the Cosmos; the Latin title is also given as Tractatus de sphaera, Textus de sphaera, or simply De sphaera) is a medieval introduction to the basic elements of astronomy written by Johannes de Sacrobosco (John of Holywood) c ...
Book III describes his work on the precession of the equinoxes and treats the apparent movements of the Sun and related phenomena. Book IV is a similar description of the Moon and its orbital movements. Book V explains how to calculate the positions of the wandering stars based on the heliocentric model and gives tables for the five planets.
Book III covers the length of the year, and the motion of the Sun. Ptolemy explains Hipparchus' discovery of the precession of the equinoxes and begins explaining the theory of epicycles. Books IV and V cover the motion of the Moon, lunar parallax, the motion of the lunar apogee, and the sizes and distances of the Sun and Moon relative to the ...
Book three discusses the signs of the zodiac, which are depicted in this 16th-century manuscript. Books two and three deal mainly with the finer details of the zodiac. [38] Book two opens with a preface in which Manilius presents a brief history of hexameter poetry, singling out Homer and Hesiod. The purpose, Volk argues, is to emphasize the ...
It is a group of technical books, except for the first one, which is a description of the contents of the other treatises. The books are: Libro de la ochava espera, "Book of the eighth sphere" Libro del alcora; Libro del astrolabio redondo, "Book of the round astrolabe" Libro del astrolabio llano, "Book of the flat astrolabe"
Somnium (Latin for "The Dream") — full title: Somnium, seu opus posthumum De astronomia lunari — is a novel written in Latin in 1608 by Johannes Kepler.It was first published in 1634 by Kepler's son, Ludwig Kepler, several years after the death of his father.
Newton's diagram 'to find the force of the Sun to perturb the Moon' accompanying Book 3, Proposition 25 of the Principia. Shown here is Newton's diagram from the first (1687) Latin edition of the Principia (Book 3, Proposition 25, p. 434). Here he introduced his analysis of perturbing accelerations on the Moon in the Sun-Earth-Moon system.
The book also provides some cursory details about astronomy at the knowledge level of the end of the 19th century. Similarly, astrology and its history are dealt with briefly in the introduction, and some other basic astrological references are scattered throughout the book, although downplayed.