Reference for Rosh Hashanah 41:9

אמר להו רב נחמן להנהו נחותי ימא אתון דלא ידעיתו בקביעא דירחא כי חזיתו סיהרא דמשלים ליומא בעירו חמירא

should commence in the earlier half [hodesh]<span class="x" onmousemove="('comment',' Lit., 'newness'. I.e., the first fourteen days. The New Moon of Nisan must be timed so that this can take place.');">²⁰</span> of Nisan. R'Nahman said to those who were going to sea: As you will not know when New Moon is fixed, [I will tell you what to do].

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