Siman 189 Seifim 8 - 12 

 

  1. If she saw 3 times over a period of three months in a skipping fashion and then repeated the pattern two more times, she has established a vesses of cyclical skipping.  For example, if she saw on the 15th of Nisan, the 16th of Iyar and the 17th of Sivan, then again saw on the 15th of Tamuz, the 16th of Av and the 17th of Elul and then again on the 15th of Tishrei, the 16th of Cheshvan and the 17th of Kislev, she has established a cyclical skipping vesses.  She then suspects the 15th, 16th and 17th of months 1, 2 and 3 respectively.
     

  2. If she saw on the first of Nisan, the first of Sivan (2 months later) and the first of Av (two months after that), she has established a vesses  for rosh chodesh that skips months.  However, if she saw on the 1st of Nisan, the 1sy of Iyar and the first of Tamuz and she did not see on the 1st of Sivan, she has not established any vesses
     

  3. If she saw on the 15th of Nisan, the 16th of Iyar and the 18th of Sivan, she has not established a vesses because she "jumped" in the third month and didn't see until the 18th.
     

  4. If she experiences one or two skipping month cycles she does not suspect the corresponding day in the coming month even though we do suspect the corresponding days of other types of vestos.  She does not suspect the skipping vesses until she has established it.
     

  5. For this month-jumping pattern (described in Seif 9), the first cycle is counted as the first of the three required sightings according to everyone, even though her periods were delayed.  With respect to suspecting her vesses, the rules are similar to that of a skipping vesses in which she suspects only from one rosh chodesh to the next.  For example, if she saw on the first of Nisan she suspects the first of Iyar.  If she did not see until the first of Sivan she suspects the upcoming first of Tamuz.  If she does not see on the 1st of Tamuz, she does not suspect the 1st of Av, even though there would be a 2 month spread from her previous period (mirroring her 2 month spread of the previous set of cycles)
     


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