Les Passages de Vénus Sur Le Disque Solaire by Edmond Paulin DuBois 1873

This is a French language book that discusses the theory and observation methods for the transit of Venus that was to occur in 1874 that would be used to determine the diameter of the Earth's orbit, which is needed in order to determine the distances to the stars. The front cover on this volume is detached and the volume was once in the US Patent Office Library and the Library of Congress.