Re: GENERAL : Fifth Night of Chanukah

[Kollel Iyun Hadaf]

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Re: GENERAL : Fifth Night of Chanukah

The Kollel wrote:
>>The fifth day of Chanukah is 29 Kislev. The rules for determining
>>whether any calendar day can fall out on any particular weekday are as 
>>follows:
>>Regarding the variable months of Kislev and Teves, the rule is that
>>there can be three combinations: Either both are 29 (the year is
>>'Chaser'), or both are 30 (the year is 'Malei'), or Cheshvan is 29
>>and Kislev is 30 (the year is 'k'Sidran', i.e. these two months
>>follow the pattern of the rest of the months). The fourth
>>possibility is *not* acceptable: Cheshvan cannot be longer than Kislev.

Mr. Nathan Szyszko comments:

There are 4 days that Rosh hashana can come out on and 3 possible
ways for cheshvan and kislev: 

(1) 29 - 30;

(2) 30 - 30;

(3) and 29 - 29.

But if you study Option (1): 29,30 does not take place if Rosh
Hashanah is Shabbos or Monday.

Also if Rosh Hashana is Tuesday (only if the previous Pesach was
Sunday and thus the rarest), then combination (1): 29,30 is the only option. 

Thus, only Rosh Hashana on Thursday has the 3 options for Cheshvan/Kislev. 

In summary, while 12 possible options for Cheshvan/Kislev (4 times 3)
exist, in actuality only 7 combinations are possible. Rosh Hashana
Shabbos or Monday - 30,30 or 29,29; Thursday, all 3 options; and
Tuesday only 29,30. 

The rarest option is Thursday 29,29 which results in Asarah b'Teves
on Wednesday. This happens when the next Pesach is on Sunday and is
also a Shana Meuberes (Leap Month - 2 Adars). This will happen unless
Moshiach comes first in 5768.

Nathan


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