YUTORAH: R' Reuven Brand -- Recent Shiurim
Einstein, Bergson and the Sunny Sukkah
Sep 24, 2026 · 16 min · 5 segments
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YUTORAH: R' Reuven Brand -- Recent Shiurim
Sep 24, 2026 · 16 min · 5 segments
Reuven BrandHost
Sforno doesn't develop this idea, but he puts it out there, and I once heard from Rabbi Dr. Nathan Lopez-Cordozo, I think it was, who came to one of the Kol Elion lunches, and he spoke about the Sforno in the perspective of resolving the tension between the Sh'nas HaChama and the Sh'nas HaLevanah.
Shomer Eschor HaShoah Aviv Chazal interprets that you have to make sure to add an Ibur, you have to add an extra month to ensure that Pesach falls out in the spring.
Because if you don't calibrate the calendar, so the disparity of the 365 minus 354 and a quarter is going to leave you after a couple years with your Pesach being at some other time.
We have a Yibriyar so that you maintain that Shomar is Chodesh Aviv, that Pesach will always be the Chag Aviv.
So essentially what the Sona alludes to in a very short piece is that Chazal are telling us that we constantly have to calibrate the solar calendar and the lunar calendar.
But the moon, of course the moon is fixed because it has cycles, but it has a certain experiential quality, almost like a magnetic pull that is, it seems at least, subjective.
One reflection of that might just be the fact that the moon gets larger and smaller.
So it feels like it's going through a change, even though the time is tracked, but it feels different.
Sforno doesn't develop this idea, but he puts it out there, and I once heard from Rabbi Dr. Nathan Lopez-Cordozo, I think it was, who came to one of the Kol Elion lunches, and he spoke about the Sforno in the perspective of resolving the tension between the Sh'nas HaChama and the Sh'nas HaLevanah.
Shomer Eschor HaShoah Aviv Chazal interprets that you have to make sure to add an Ibur, you have to add an extra month to ensure that Pesach falls out in the spring.
Because if you don't calibrate the calendar, so the disparity of the 365 minus 354 and a quarter is going to leave you after a couple years with your Pesach being at some other time.
We have a Yibriyar so that you maintain that Shomar is Chodesh Aviv, that Pesach will always be the Chag Aviv.
So essentially what the Sona alludes to in a very short piece is that Chazal are telling us that we constantly have to calibrate the solar calendar and the lunar calendar.
But the moon, of course the moon is fixed because it has cycles, but it has a certain experiential quality, almost like a magnetic pull that is, it seems at least, subjective.
One reflection of that might just be the fact that the moon gets larger and smaller.
So it feels like it's going through a change, even though the time is tracked, but it feels different.
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