[Avodah] Theoretical and Real Shiurim

[Micha Berger]

On Thu, Apr 05, 2012 at 05:04:23PM -0400, Zev Sero wrote:
: On 5/04/2012 4:56 PM, Micha Berger wrote:
:> Let me do it stepwise:
:> 44 cm/ammah / 24 etzba/amah = 1.3 cm / etzbah

: You mean 1.833

:  2 x 2 x 2.7 etzbah = 3.67 x 3.67 x 4.95 cm = 19.8 cc

: Oops.  What are you doing there?  Try again.

Ah, I see, I only did the etzba to cm conversion once rather than
thrice. 66.7 cc / revi'is it is, yeilding a kezayis of 22.3 cc.

In terms of olive trees still around from Chazal's day, the largest
are shami olives, but they run about half that -- and we are aiming for
the medium. So much for getting a consistent value through historical
recreation!

Or, comparing to acharonic shitos, we get somewhere between the CI's
*lemaaseh* of 17cc and R' Naeh's 27cc. I should point out that my attempt
at defining an archeological ammah is also slightly below RACN's at a
range of 43.25 - 44.4 cm.


: On 5/04/2012 4:56 PM, Micha Berger wrote:
:> 5- Rambam, Hil' Shemitah veYovel 10:5 says the geonim of EY had a broken
:> mesorah about which year was shemittah (derabbanban), because the[y] didn't
:> account for shemittah during bayis I and II. Still, he says their ruling
:> is binding anyway.

: On the contrary, he says they have an *unbroken* mesorah that what Chazal
: did during Galus Bavel and again after churban bayis sheni was different
: from what he thinks they ought to have done.  And he therefore defers to
: that mesorah, and the count that results from it, because he accepts that
: it is unbroken since Chazal's time.

Yes. I was *trying* to say they had a mesorah of a broken value for
which year is shemittah. After all, that is a 5th example of process
defining law despite our (or in this case, the Rambam's) determination
of the facts.

Tir'u baTov!
-Micha

-- 
Micha Berger             Spirituality is like a bird: if you tighten
micha at aishdas.org        your grip on it, it chokes; slacken your grip,
http://www.aishdas.org   and it flies away.
Fax: (270) 514-1507                            - Rav Yisrael Salanter