Gemara:

Berachot 

Collections: R' Roy Feldman In Depth Talmud - Berakhot

References: Berachot: 2a  

Description

Do the proper times for reciting the Shema depend on definitions of "day" and "night," or on the times people go to sleep and wake up? The lecture concludes with several justifications for communal practices of reciting shema early at night, and late in the morning.