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I know that usually, Yom Nicanor is displaced by the Fast of Esther. But in years (such as 2013 / 5773) when the Fast of Esther is displaced due to Shabbat, may Hallel be said on the 13th of Adar, Yom Nicanor?

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+1 There is a great question in here. –  Double AA Feb 22 '13 at 13:52
Hi goljerp and welcome to Mi Yodeya! Thank you for bringing this interesting question here. I hope you enjoy the site. –  Monica Cellio Feb 22 '13 at 15:09
I, for one, have never heard of Yom Nicanor. This question could be improved with some reference to what it is, why someone might want to say Hallel on it, and why we normally don't. –  Isaac Moses Feb 22 '13 at 15:11
@IsaacMoses Yom Nikanor is a holiday in Megillat Taanit on 13 Adar. The strange part is I would have guessed that anyone who knew about Yom Nikanor would know how the Talmud concludes that Megillat Taanit is batel. The more interesting question IMO is did they say hallel on that day during the times of the Mikdash. –  Double AA Feb 22 '13 at 15:44
@sethj I think everyone agrees taanit Esther wasn't around until the gaonim's time. –  Double AA Feb 22 '13 at 17:07

1 Answer 1

Although I am not able to give a source, I do have an answer, as follows: The halochah is that saying hallel on a day when there is no minhag to do so is blasphemy. Also, a requirement of hallel is that on that day there was an open miracle (one the defies the normal rules of nature). Therefore, if there is no minhag to say hallel on Yom Nicanor and no open miracle occured on that day, we can safely assume that you cannot say hallel on Yom Nicanor.

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What is the source for this halacha (that "saying hallel on a day when there is no minhag to do so is blasphemy")? –  AGC 11 hours ago
"Yom Nicanor and no open miracle occured on that day" Well, that is the question, as it seems one did (depending on how you define "open"). –  Yishai 9 hours ago
@AGC, Shabbos 118b. See the first four pages here for reasons - they all revolve around the theme of the lack of a clear miracle (as opposed to hidden ones) in every day life. –  Yishai 9 hours ago

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