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In this text Angelo Secchi presented the results of his studies and contributed to deepen the knowledge of the chemical-physical nature of the sun.
This book is preserved at INAF-Palermo Astronomical Observatory, Historical Library. Bibl.: Chinnici 2014, pp. 80-82; Chinnici 2009, p. 201.
Credits: INAF- Osservatorio Astronomico di Palermo
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