There is a well known argument between the Magen Avraham and the Vilna Gaon (and Baal HaTanya) about the latest times for davening and Shema. What is less well known is the reasons behind their argument. The Magen Avraham counts the hours from dawn (Alos HaShachar) until nightfall (Tzeis HaKochavim) whereas the Gaon counts from sunrise (HaNetz haChama) until sunset (Shkiah).
Rabbi Triebitz learns the gemara, focussing on 2 Tosefosim on 3a and 3b. There is also a Gra on 459 and a Chazon Ish in Orech Chaim (links to follow).
Next week will be the final shiur in this current series.
Please contact me if you would like to attend the shiurim in person. They are held in Jerusalem on Mondays from 5:30-6:30. Please e-mail me to find out where the secret location is.
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Video of shiur 8
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Sources of Halacha 08
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Source of Halacha 08