טו אמר רב יהודה אמר שמואל אין מעברין את השנה אלא א"כ היתה תקופה חסירה רובה של חודש וכמה רובה של חודש ששה עשר יום דברי רבי יהודה
15 The text [states]: 'Samuel said, The year is not to be intercalated on the thirtieth day of Adar, since it is eligible to be appointed [the first day of] Nisan.' But what if it were intercalated? — 'Ulla said: The month must not be sanctified.<span class="x" onmousemove="('comment',' As the second Adar. The succeeding month, however, will he sanctified as Nisan, the current month remaining unnamed. ');"><sup>26</sup></span> But what if it were sanctified? — Raba said: Then the intercalation is invalid. R Nahman said: Both the intercalation and the sanctification are valid. Raba said to R. Nahman: Let us consider! Between Purim<span class="x" onmousemove="('comment',' Feast celebrated on the fourteenth of Adar in commemoration of the deliverance of the Jews from the plot of Haman, as recorded in the Book of Esther. ');"><sup>27</sup></span> and the Passover there are thirty days, and from Purim we begin to lecture on the laws of Passover, as has been taught: People must begin to inquire into the Passover laws thirty days before the Festival. R. Simeon b. Gamaliel said: A fortnight before. If, then, it [sc. Passover] is postponed at the beginning of the month [of Nisan],<span class="x" onmousemove="('comment',' Through the institution of a second Adar, the lecturing on Passover laws having already begun. ');"><sup>28</sup></span> people<span class="x" onmousemove="('comment',' Not believing the report of the messengers that an intercalation had been made. — Raba's assumption that the messengers might be disbelieved, would seem to show that there were enemies of the Jews who might seek to upset the Calendar. Cf. p. 52, n. 9 on the attitude of the Roman authorities to intercalation. ');"><sup>29</sup></span> will be liable to disregard<span class="x" onmousemove="('comment',' Lit., 'treat lightly'. ');"><sup>30</sup></span> the law regarding leaven [on Passover].<span class="x" onmousemove="('comment',' Because they will not treat the Passover fixed by the Rabbis as such, having already celebrated it a month before. ');"><sup>31</sup></span> — He [R. Nahman] answered him: It is well-known that the intercalation of a year depends on [minute] calculations, hence they would say that [the declaration was not made until the thirtieth day] because the Rabbis had not completed their calculation until then. Rab Judah said in Samuel's name: A year is not to be intercalated<span class="x" onmousemove="('comment',' On account of the Tekufah. V. supra 11b. ');"><sup>32</sup></span> unless the [summer] Tekufah<span class="x" onmousemove="('comment',' The solar year which consists of three hundred and sixty-five and a quarter days is divided into four equal parts, each period consisting of ninety-one days and seven and a half hours. These are called respectively the Nisan (vernal), Tammuz (summer), Tishri (autumnal), Tebeth (winter) Tekufoth. The lunar year which forms the basis of our calendar comprises altogether three hundred and fifty-four days. Though according to Biblical tradition our months are to be lunar (cf. Ex. XII, 2), yet our Festivals are to be observed at certain agricultural seasons; Passover and Pentecost in the Spring; Tabernacles, or Feast of Ingathering, in the autumn. In order to harmonise the lunar and solar years, a second Adar is intercalated once in two or three years. Our text lays down certain principles by which the Intercalators are to be guided. ');"><sup>33</sup></span> is short of completion by the greater part of the month.<span class="x" onmousemove="('comment',' Tishri. I.e., the greater part of Tishri must be taken in to complete the Tekufah of Tammuz. ');"><sup>34</sup></span> And how much is that? — Sixteen days: so holds R. Judah.