Why a Second Day of Yom Tov?
The Incomparable Greatness of the Land of Israel
Since the days of Hillel HaNasi, an official and fixed Jewish calendar (independent of eye witnesses) is in operation and, consequently, there is no longer any doubt about which day is the correct day of Yom Tov. Why then, did the Sages did not annul the second day Yom Tov?