De Bissexto Liber

De Bissexto Liber, subtitled "Nova Temporis Facula, Qua Intercalandi Arcana, Hactenus Obscura, Illustrantur. Accedit Dierum Apud Indos Diorthosis," by Erycius Puteanus, delves into the intricacies of intercalation and time reckoning. Published in 1637, this work seeks to illuminate the mysteries surrounding the bissextile year and the complexities of accurately measuring time. Addressed to Philippus IV, monarch of Spain and the Indies, it also includes a discussion of the days as reckoned by the Indians. This historical treatise offers insights into 17th-century scientific thought and calendrical systems.

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