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When we add the words "Ulichaporas Pasha" during Musaf of Rosh Chodesh when it's a leap year, when is the year determined - Nisan or Tishrei?

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In sidur vilno it is written: "on a leap year, till rosh chodesh nisan, add the following..." – jutky Feb 2 '14 at 11:59
does this mean the leap year counts from Nisan to Nisan? – DaagahMinayin Feb 2 '14 at 13:26
@DaagahMinayin I don't know what it means to "count" as a leap year. – Double AA Feb 2 '14 at 18:14
@DoubleAA That is, in which months do we add those words to the t'fila? – msh210 Feb 2 '14 at 19:52

The sefer אליהו רבה Siman 423 writes that it should be said for all the months of the leap year, but the custom is to say it only until Rosh Chodesh Nisan. The Pri Megadim explains that the Eliyahu Rabbah means that if not for our custom to stop after Adar we should really continue saying it until Tishrei. (The מהרי"ב explains that our custom of stopping after Adar is because these words were added in a leap year in order that people will realize that it is a leap year, and therefore after the second Adar there is no longer a purpose to this addition.)

According to this we add the words ולכפרת פשע from Tishrei.

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Ah, so we say it until the extra month happens. Got it. – DaagahMinayin Feb 2 '14 at 13:27

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