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 individual gave considerable thought to the examination of the Jewish calendar. He is said to have found that the pattern of days of the week for any particular festival repeats itself after a period of 247 years, and that the years can be categorized based on their characteristic dates in 14 distinct tables.