El-Mas'udi's Historical Encyclopaedia, Entitled Meadows of Gold and Mines of Gems

El-Mas'udi's Historical Encyclopaedia, Entitled Meadows of Gold and Mines of Gems

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1841 edition. Excerpt: ...representer leur inegalite dans cette hypothese. Que l'on imagine un mouvement sur une premiere circonference, dont la terre occupe le centre, celui d'une seconde circonference sur laquelle se meut le centre d'une troisieme circonference, et ainsi de suite jusqu'a la derniere, que l'astre decrit uniformement. Si le rayon d'une de ces cil-conferences surpasse la somme des autres rayons, le mouvement apparent de l'astre autour de la terre sera compose d'un moyen mouvement uniforme, et de plusieurs inegalites dependantes des rapports qu'ont entre eux les rayons des diverses circonferences et le mouvement de leur centre et de l'astre; on peut donc, en multipliant, et en determinant convenablement ces quantites, representer toutes les inegalites de ce mouvement apparent." The stars visible to the eye and all others are in the eighth sphere, which does not make its revolutions round the pole of the general sphere (being excentric). They bring as proof for the difference of the motion of the sphere of the zodiac from that of the other spheres, that the twelve zodiacal signs follow each other in their course, without change in their relative position and alteration in their motion in rising and setting. Every one of the planets has a different motion, for there is a discrepancy in their course; sometimes the motion is quicker, sometimes it goes towards the south, other times to the north. They (the astronomers), define the SPHERE Jiill as the end 5ig_L@ll (universe), for it embraces the higher and lower nature. The definition in reference to its natural quality is, that it is a round form, and the largest (concrete) form...show more

Product details

  • Paperback
  • 189 x 246 x 6mm | 213g
  • Rarebooksclub.com
  • English
  • Illustrations, black and white
  • 1236853016
  • 9781236853011