Abstract
This chapter deals with the most important eras used in rabbinic chronology. It discusses the Liber erarum, which probably goes back to a Hebrew original, written by a Jewish author. Following the chronological prologue, the Liber erarum offers a succinct outline of the time units used by the Jewish calendar and introduces its most basic parameter 29d 12h 793p for the mean month or interval between two conjunctions. The ascription to Ada was evidently also known to the author of the Liber erarum, the present Latin version of which renders his name as Rabada filius Hahaha. His estimate of the solar year is contrasted with the value traditionally ascribed to Samuel, which is identical to the 365.25d of the Julian calendar, leading to an average solar month of 30 days and 10 ½ hours and a difference of 10d 12h 204p between the solar year and the average lunar year.Keywords: Hebrew; Jewish calendar; Julian calendar; Liber erarum; rabbinic chronology
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