Excerpt from Géographie du Moyen Age, Vol. 2De même que la sphère céleste, différents instruments arabes se trouvaient aussi dans les mains des latins et on les fabriquait à l'usage des astronomes et des navigateurs. Raimond Lulle, en 1293, inventa et décrivit dans son arte de navegar, un astrolabe, car des instruments d'astronomie nautique, propres à trouver sur mer l'heure de la nuit au moyen des étoiles, existaient vers la fin du xm° Siècle dans la marine catalane et majorquine.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.