Commentary for Niddah 130:10

וכמה

and the latter to the summer and winter solstices?<span class="x" onmousemove="('comment',' Lit., 'in the cycle of Tammuz and Tebeth'. Since the days and the nights are unequal an 'onah of twelve hours is half a day and half a night. Now in view of this definition and explanation, how could R. Simeon b. Gamaliel maintain (supra 65a ad fin.) that an 'onah is 'a night and half a day'? ');">⁹</span>

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