Dans ce livre, trois éminents scientifiques examinent les opérations qui ont été effectuées en France pour relier les observatoires de Paris et de Greenwich. En utilisant une série de mesures complexes et de calculs astronomiques, ils ont achevé cette grande entreprise scientifique. C'est un livre essentiel pour tous les astronomes, les physiciens et les scientifiques intéressés par l'histoire de leur champ. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.