Berachot 1:2
Mishna: Zeraim, Berachot, 1:2
Summary: The Mishna discusses the appropriate time window for recitation of the morning Shema.
Conclusion(s): Start time: When colors can be distinguished (white vs. blue or blue vs. green. End time: The third hour (R. Eliezer says sunrise). Saying the Shema later is not prohibited as it is considered Torah study.
Observation(s): I am wondering whether the end time of dawn for the evening Shema can overlab with the start time of the morning Shema.
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