The Counting of The Omer starts on the second night of Pesach. It continues for seven weeks, or forty-nine days. The fiftieth day is Shavuos.
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What is Lag BaOmer?
Lag B’Omer – The thirty-third day of the Omer, which occurs on the 18th of Iyar, is a day of celebration for the whole nation of Israel. According to tradition, the students of the great sage Rabbi Akiva, who had been dying in great numbers, stopped dying on this day.