SECCHI, PIETRO ANGELO, S.J. Le Soleil. Exposé des Principales Découvertes Modernes sur la Structure de cet Astre,son Influence dans l'Univers, et ses Relations avec les autres Corps Célestes. 3 folding spectrographic plates, including 2 hand-colored; 129 text illustrations. xvi, 422 pages, including half-title. first edition * Le Soleil . . . Deuxième Édition, Revue et Augmentée. 13 plates, all but one in color. xx, 428; viii, 484 pages; 6 double-page spectrographic plates.  pages. 3 volumes, including atlas * Les Étoiles. Essai d'Astronomie Sidérale. 17 plates, including 9 in color. , xiv, 208; , 235,  pages, plus publisher's 48-page catalogue. 2 volumes. first edition in french. Together, 3 works in 6 volumes. Various sizes, first work in contemporary 1/2 morocco gilt with slightly faded spine, original wrappers bound in, second in contemporary 1/4 morocco gilt, third in original cloth with faded spines and Volume 1 joints partly cracked; varying foxing in all 3 works. Paris: Gauthier-Villars, 1870; Gauthier-Villars, 1875; Germer Baillière et Cie., 1879
Estimate $300 - 500
'A pioneer in the study of the physical characteristics of celestial bodies, Pietro Angelo Secchi, S.J., observed spectra of the stars, classified more than 4,000 of them according to a scheme he devised, and made important studies of the physical constitution of the Sun. His achievements, during the 1860s and 1870s, contributed to the rapid growth of astrophysics as a new way of studying the heavens'—BEA, page 1039-40. DSB XII, 266-70.