He devoted much attention to the study of the Jewish calendar. He is said to have found that the order of the week-days on which any particular festival occurs in successive years repeats itself after a cycle of 247 years, and that the years with regard to their characteristic dates can be arranged in 14 tables.
This person gave considerable attention to the analysis of the Jewish calendar. He is said to have discovered that the sequence of days of the week for any specific festival repeats itself after a cycle of 247 years, and that the years can be categorized based on their distinctive dates within 14 structured frameworks.