
There are a few matters of note in this week's 
"Halacha Summary
" email from the 
shul that I would like to mention (in accordance with what the 
Rebbe, shlit"a, has said on various occasions). The first is regarding the time by which 
Shema must be recited.
In the email, it says, "According to the 
Magen Avrohom, the day is reckoned from dawn until nightfall. According to the 
Vilna Gaon, the day is reckoned from sunrise until sunset. Hence, the deadline for 
Shema according to the 
Magen Avrohom is earlier than that of the 
Vilna Gaon. The custom is to follow the opinion of the 
Vilna Gaon which gives a later deadline. It is praiseworthy to 
daven with a 
minyan that reaches 
Shema before the deadline of the 
Magen Avrohom."