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Reference of Measurements in Halacha: Difference between revisions

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Reference of Measurements in Halacha (view source)

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* '''Gemara Pesachim''' 94a records Rabbi Yochanan's statement that an average person can walk 30 mil from Netz HaChama until Shekiyah and 5 mil from Shekiyah until Tzet HaKochavim (according to Rashi D”H Ovav). The Gemara challenges this and explains really an average person can walk 32 mil from Netz HaChama until Shekiyah and only 4 mil from Shekiyah until Tzet HaKochavim.  
* '''Gemara Pesachim''' 94a records Rabbi Yochanan's statement that an average person can walk 30 mil from Netz HaChama until Shekiyah and 5 mil from Shekiyah until Tzet HaKochavim (according to Rashi D”H Ovav). The Gemara challenges this and explains really an average person can walk 32 mil from Netz HaChama until Shekiyah and only 4 mil from Shekiyah until Tzet HaKochavim.  
* '''The opinion of Rabbenu Tam:''' Tosfot (Pesachim 94a D”H Rabbi Yehuda and Shabbat 35a D"H Trei) is bothered how the Gemara Shabbat seems to say that from Shekiyah until Tzet HaKochavim a person can walk 3/4 of a mil (according to the Rabba) and the Gemara Pesachim says a person can walk 4 mil. Rabbenu Tam answers that the Gemara Shabbat was referring to the end of the Shekiyah and from then until Tzet HaKochavim is 3/4 of a mil, while the Gemara Pesachim is discussing the end of Shekiyah which takes 4 mil until Tzet HaKochavim. Ramban (cited by Maggid Mishna), Maggid Mishna (Shabbat 5:4), and Ran (Shabbat 15a) agree. The Ran (Shabbat 15a) explains that according to Rabbenu Tam there's two Shekiyot. After the first it is still considered daytime until 3.25 mil after the beginning of the Shekiyah. Ben HaShemashot, which is uncertain day or night, spans .75 of a mil and begins from the beginning of the second Shekiyah. See Biur Halacha 261 D"H Metechila explains that the first Shekiyah is when the sun sets from our vision, and the second Shekiyah is when the light from the sun leaves the sky.
* '''The opinion of Rabbenu Tam:''' Tosfot (Pesachim 94a D”H Rabbi Yehuda and Shabbat 35a D"H Trei) is bothered how the Gemara Shabbat seems to say that from Shekiyah until Tzet HaKochavim a person can walk 3/4 of a mil (according to the Rabba) and the Gemara Pesachim says a person can walk 4 mil. Rabbenu Tam answers that the Gemara Shabbat was referring to the end of the Shekiyah and from then until Tzet HaKochavim is 3/4 of a mil, while the Gemara Pesachim is discussing the end of Shekiyah which takes 4 mil until Tzet HaKochavim. Ramban (cited by Maggid Mishna), Maggid Mishna (Shabbat 5:4), and Ran (Shabbat 15a) agree. The Ran (Shabbat 15a) explains that according to Rabbenu Tam there's two Shekiyot. After the first it is still considered daytime until 3.25 mil after the beginning of the Shekiyah. Ben HaShemashot, which is uncertain day or night, spans .75 of a mil and begins from the beginning of the second Shekiyah. See Biur Halacha 261 D"H Metechila explains that the first Shekiyah is when the sun sets from our vision, and the second Shekiyah is when the light from the sun leaves the sky.
* '''Does halacha follow Rabbenu Tam?''' The S"A 261:2 rules in accordance with Rabbenu Tam and states that from the beginning of the Shekiyah until Ben HaShemashot there's 3.25 mil and then Ben HaShemashot itself is .75 of a mil, which is equivalent to the time it takes to walk 1500 amot.
* '''Does halacha follow Rabbenu Tam?''' The S"A 261:2 rules in accordance with Rabbenu Tam and states that from the beginning of the Shekiyah until Ben HaShemashot there's 3.25 mil and then Ben HaShemashot itself is .75 of a mil, which is equivalent to the time it takes to walk 1500 amot. Biur Halacha 261 D"H Metechila writes that for sure one should be strict for the Gra not to do any melacha after sunset.  
* '''Explanation of Rabbi Yose's opinion:''' Shmuel (Shabbat 35a) says that Rav Yose’s concept of Ben HaShemashot takes place after the Ben HaShemashot already finished. Tosfot (Shabbat 34b D"H Rabbi Yose) explains that even according to Rabbi Yose there’s a window of time when there is an uncertainty whether it is day or night but it isn’t as long as it is for Rabbi Yehuda. Rosh 2:23 discusses whether Rabbi Yose's Ben HaShemashot begins immediately after Rabbi Yehuda's or a while afterwards and doesn't come to a clear conclusion.
* '''Explanation of Rabbi Yose's opinion:''' Shmuel (Shabbat 35a) says that Rav Yose’s concept of Ben HaShemashot takes place after the Ben HaShemashot already finished. Tosfot (Shabbat 34b D"H Rabbi Yose) explains that even according to Rabbi Yose there’s a window of time when there is an uncertainty whether it is day or night but it isn’t as long as it is for Rabbi Yehuda. Rosh 2:23 discusses whether Rabbi Yose's Ben HaShemashot begins immediately after Rabbi Yehuda's or a while afterwards and doesn't come to a clear conclusion.
* '''Who does the halacha follow?''' The Briatta (Shabbat 34b) says that in regards to practical ramifications Ben HaShemashot is always considered day as a stringency and night as a stringency. Rif (Shabbat 14b) and Rambam (Shabbat 5:4) codify this Briatta. S"A 261:1 rules that during Ben HaShemashot one may not doing anything one may not do on Shabbat with some exceptions (see there). Rabbi Yochanan (Shabbat 35a) says that we follow Rabbi Yehuda regarding Shabbat as a stringency and Rabbi Yose regarding Trumah as a stringency. Rif (15a) and Rosh 2:23 codify Rabbi Yochanan as halacha.
* '''Who does the halacha follow?''' The Briatta (Shabbat 34b) says that in regards to practical ramifications Ben HaShemashot is always considered day as a stringency and night as a stringency. Rif (Shabbat 14b) and Rambam (Shabbat 5:4) codify this Briatta. S"A 261:1 rules that during Ben HaShemashot one may not doing anything one may not do on Shabbat with some exceptions (see there). Rabbi Yochanan (Shabbat 35a) says that we follow Rabbi Yehuda regarding Shabbat as a stringency and Rabbi Yose regarding Trumah as a stringency. Rif (15a) and Rosh 2:23 codify Rabbi Yochanan as halacha.
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