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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 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 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.
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"
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 ...
Two pages from the Ratdolt edition of the De astronomia showing woodcuts of the constellations Cassiopeia and Andromeda.Courtesy of the US Naval Observatory Library. De astronomia (Latin: [deː äs̠t̪rɔˈnɔmiä]; Concerning Astronomy) [nb 1] is a book of stories written in Latin, probably during the reign of Augustus (c. 27 BC – AD 14).
In astronomy and celestial navigation, an ephemeris (/ ɪ ˈ f ɛ m ər ɪ s /; pl. ephemerides / ˌ ɛ f ə ˈ m ɛr ɪ ˌ d iː z /; from Latin ephemeris 'diary', from Ancient Greek ἐφημερίς (ephēmerís) 'diary, journal') [1] [2] [3] is a book with tables that gives the trajectory of naturally occurring astronomical objects and artificial satellites in the sky, i.e., the position ...
This version of trepidation is described in De motu octavae sphaerae (On the Motion of the Eighth Sphere), a Latin translation of a lost Arabic original. The book is attributed to the Arab astronomer Thābit ibn Qurra , but this model has also been attributed to Ibn al-Adami and to Thabit's grandson, Ibrahim ibn Sinan . [ 3 ]