The Talmud famously says (in a Baraita on Sukkah 29a) that the Jewish people calculate our calendar by the moon (lunar calendar), and the Nations of the World use the sun (solar calendar). How is this understood as far as the Arab/Muslim calendar which is lunar, and likewise the Chinese calendar, which uses the moon? If, however, these peoples are an exception to the rule, why so? (I heard there is a Maharal about this, but I don't know where.)
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8The Muslim point is less relevant because Muslims weren't around when the Talmud was composed.– Harel13Commented Mar 31, 2023 at 7:09
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The Romans had a roughly lunisolar calendar until Julius Caesar, and was probably lunar going further back en.wikipedia.org/wiki/Roman_calendar#Republican_calendar, so the gemara probably was just referring to the nations they had direct contact with (Greeks/Romans)– AKACommented Mar 31, 2023 at 11:49
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1The Arabs where certainly discussed in the Talmud, and it seems they probably followed a lunar calendar even before Islam– Naftali TzviCommented Mar 31, 2023 at 17:02
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@NaftaliTzvi you're right Arabs are mentioned in the Talmud. From the Wikipedia article I linked below it seems we don't really know what calendar they used, but probably at least some were lunar or lunisolar. Note, however, that the relevant passage in the Gemara is a Baraita. There are far fewer Tanaitic references to Arabs (the only one I'm aware of is Ohalot 18:10). Somewhat relatedly, there are also fewer references to Arabs in the Talmud Yerushalmi than the Bavli.– AvrahamCommented Apr 1, 2023 at 17:19
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@Avraham Arabs are also mentioned in Chazalic sources under the names טייעא, נותי, סדקי/סרקי, as well as naming specific Arab kingdoms or lands, such as תדמור/תרמוד (Palmyra), מישן (Meshan), חדייב (Adiabene), תימן (Yemen), and more.– Harel13Commented Apr 1, 2023 at 19:02
1 Answer
I have also been bothered by this exact question and I have not found an answer inside. The Maharal does deal with this midrash in Beer HaGolah 6:2, but his focus is more on explaining how eclipses indicate sin, especially given that they are predictable astronomical phenomena. As @Harel13 says above, I'm not particularly troubled by the Islamic calendar per se because it post-dates the Talmud. It may also be partly based on the Jewish calendar. See https://en.wikipedia.org/wiki/Islamic_calendar. (Though probably at least some Arabs were using a lunar or lunisolar calendar beforehand, which presents the same issue. See below.)
But more generally, Chazal were certainly familiar with non-Jewish lunar calendars. Most importantly, the Babylonians used a calendar very similar to the Jews, including the same lunar months and a 19-year Metonic cycle of intercalated months. Hazal were also familiar with Arabs, who are mentioned in many places in the Talmud, though who knows how familiar they were with the Arabic calendar. (There were also other pre-Talmudic cultures the Rabbis were not in contact with that used the lunar calendar, https://en.wikipedia.org/wiki/Lunar_calendar).
My best explanation so far is that Chazal are speaking in generalities and don't mean all goyim. Or "goyim" may be shorthand for Greece and Rome in particular, given that the statement in Sukkah 29a is a Tannaitic Baraita. You could probably come up with a nice drash about the sun and the moon and Jacob and Esau. (Obviously the Tannaim would have been familiar with Arabs and Babylonians, both of whom are mentioned in Tanakh and Tannaitic sources; my point is they wouldn't have been at the front of a Tanna's mind. In the same way, when American rabbis today say "the non-Jews do such" and such they usually don't mean China).
Another puzzle, not mentioned by OP, is that the Jewish calendar is based on the moon and the sun. So why don't solar simanim also affect the Jews? This svara would support the first Baraita that a solar eclipse is bad for the whole world and pose a problem for the second Baraita that says the Sun is a siman for non-Jews specifically.