tag:blogger.com,1999:blog-30932360.post115846638320266656..comments2023-10-31T08:48:55.890-04:00Comments on Daf Yomi DafYomi Daf-Yomi: Daf Yomi - Sukkah 14/15 - Masters in Physics RequiredAvromihttp://www.blogger.com/profile/13593992238707872967noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-30932360.post-1158547089788612752006-09-17T22:38:00.000-04:002006-09-17T22:38:00.000-04:00Firstly, yasherkoach - sounds good.Secondly, Ritva...Firstly, yasherkoach - sounds good.<BR/><BR/>Secondly, Ritva wonders about this, because in the middle of the day, when the sun is directly above, the shade will be from the s’chach and not from the walls? Ritva offers two answers. One answer is that the sun is only directly above in the summer months when the sun travels in middle of the sky. In the month of Tishrei, however, when the sun is always to the side, there will be no shade from the s’chach even in the middle of the day. The second answer of the Ritva is that since in the middle of the day the walls do not provide shade, there will also not be any shade from the s’chach. The Aruch LaNer expresses his bewilderment to this answer, as the reality is that there is shade in the middle of the day. The Aruch LaNer offers a means of explaining the answer of the Ritva.<BR/><BR/>Thirdly, how do you explain the Steipler's extra two tefachim?<BR/><BR/>thanksAvromihttps://www.blogger.com/profile/13593992238707872967noreply@blogger.comtag:blogger.com,1999:blog-30932360.post-1158542829735069382006-09-17T21:27:00.000-04:002006-09-17T21:27:00.000-04:00One hundred tefachim of covering will produce one ...One hundred tefachim of covering will produce one hundred tefachim of shade only when the sun is directly overhead (that is, at local physical noon); at any other time of the day, it will produce shade whose area would be mathematically computed. I don't have the formulas handy, but the basis would be a pyramid A, whose apex is the sun, whose base is the section of ground covered by the shade, and of which the sukkah roof is a cross section parallel to the base. The exact area covered by shade would be derived from the height of the sukkah, the height of the sun from the ground, and the angle of the sun's rays, which would provide the angle at which the pyramid deviates from the perpendicular at any given time of the day. The first two would of course be constant for every sukkah; the second would be constant but would need to be individually determined for each sukkah; the third would of course need to be determined from an astronomical ephermeris or almanac, and would change throughout the day.kishnevihttps://www.blogger.com/profile/01437400043049608843noreply@blogger.com