Overview: letters, nearly all previously unpublished, are fully annotated, with explanations.of political, cultural, and technical issues.Indispensablefor understanding the wide-ranging activity of Poincaré, at.The lettersin this volume cover Poincaré‘s multifaceted career in astronomy in itsentirety, extending from the time of his first publications in 1880 to the endof his life in 1912. At a tender age, Poincaré established his authority inquestions of celestial mechanics, and his views were soon sought after on avast array of questions by the leading astronomers and geodesists of his time,i
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