Today’s Daf Yomi Question:
The Gemara concludes that we are meant to conduct ourselves stringently regarding the two opinions of bein hashmashos (i.e. melacha on Motzei Shabbos can only commence after the conclusion of the later bein hashmashos). Since bein hashmashos in itself is a period of uncertainty (safek day safek night) why is melacha not permitted during the later bein hasmashos since it is a double safek (safek sfeika) 1) maybe this moment is already past the real bein hashmashos 2) maybe bein hashmashos in itself is really night; as we know a double safek in Torah is permitted?
Our Gemara concludes that one who recites the evening shema past dawn/alos hashachar has fulfilled his obligation. How is this consistent with what was discussed earlier (on Daf 2b) that the definition of ‘day’ with regard to shema is from dawn/alos hashachar until the stars are visible/tzeis hacochavim?