Commentary for Berakhot 60:12
א"ל רב אשי לאמימר מכדי רב טעמא קאמר מה לי חסר ומה לי מלא אלא לא שנא:
Rab Ashe said to Amemar : Since Rab has stated a reason, what has it to do whether the month is full or defective ! Certainly there is no difference.
Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
Viz. the Bet Din consecrate the new month only by day.
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