Reference for Beitzah 8:9

אמר ר' זירא כותיה דרב אסי מסתברא דהאידנא ידעינן בקביעא דירחא וקא עבדינן תרי יומי

Rabbi Zeira said: "It seems logical [for the law regarding the egg] to be according to Rav Asi, since today we know the fixing of the months and we [nonetheless] do two days [of Yom Tov]."

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