Thus , the counting of the Omer begins on the second day of Passover .
Thus , the counting of the Omer continues for the next 49 days , or seven complete weeks , ending on the day before Shavuot .
Thus , the counting of the Omer begins on the second day of Passover and continues for the next 49 days , or seven complete weeks , ending on the day before Shavuot .