"The Secret of the Intercalation: On the adjustment of festivals and leap years. In the Talmud: Abba, the father of Rabbi Shmuel, said to Shmuel, 'Does the master know this matter that is taught concerning the secret of the leap, etc.' (Rosh Hashanah 20:), and Rashi explained 'the secret of the leap' in the second braita as hints. It seems from this that the 'secret of the leap' is not the braita of Shmuel, although most authors also refer to the braita of Shmuel by the name 'secret of the leap.' Wertheimer in his book 'Leket Midrash (rabbinic interpretive commentary)im' (Jerusalem, 1903) printed two sections from an old manuscript from Egypt, which are remnants and survivors of the braita discussing the 'secret of the leap.' Its style is like the language of the braita brought in the Machzor Vitry manuscript from London, and it says: 'The month of the sun is 30 days, 10 hours, and 793 parts. Twelve times it comes to 365 days and 7 hours, i.e., a quarter of a day. The solar year exceeds the lunar year by 10 days, 21 hours, and 204 parts. Therefore, we need to add one month sometimes at the end of three [years] and sometimes at the end of two [years], in order to align the lunar years with the solar years as much as possible (completion to Machzor Vitry page 7). Since only a few words were found in the two sections there, several lines are missing from them and they do not have the correct order, so I did not copy them here. See the 'Braita of Shmuel' in the entry 'Shmuel' below."