Reference for Rosh Hashanah 40:12

רבא אמר חצות לילה איכא בינייהו

What is the practical value of this remark? - R'Ashi said: To [help us in] confuting the witnesses.<span class="x" onmousemove="('comment',' Because if the conjunction is calculated to have been after midday and they claim to have seen the new moon before nightfall, they are not telling the truth.');">⁶</span>

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