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In Yerushalyaim it is common to find minyanim saying it. Furthermore, it is the official practice of the Mir yeshiva to say Yom Kippur Koton. Although the minhag is not widespread being that it is something that was practiced by exceedingly righteous as its source is in kabbala


Orach Chaim 423:4 is the source. Mishna Berura 10 explains that it is like Yom Tov, where Yom Tov is an Os, the same is by Rosh Chodesh when we say the special Musaf you take it off.


The same rule applies both nights (ShA OC 422:1). (Indeed while this seems to be explicit in the Gemara (Brachot 30b), the Beit Yosef (ibid.) notes with amazement that the Orchot Chayim quotes two rabbis who disagreed and required going back on the second night.) Mishna Berura (ibid. sk 3) explains that each day of Rosh Chodesh doesn't affect the other as ...


One consideration raised by R. M. Kasher is whether one s obligated in commandments on the moon or in outer space at all given the Torah expression “all the days which you are alive on this earth” (Deut. 12:1) in the context of mitzvos. Apparently he concluded that one is obligated see here (which cites this from JD Bleich, “Contemporary Halachic Problems”, ...

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