Halakhah su Esdra 5:78

I also investigated and discovered² Ibn Ezra now builds a case for beginning the day with dusk. that the month of Nisan is first for setting the holidays, since in that month our ancestors departed from Egypt. However, the Sabbatical year and the Jubilee year justly begin with Tishre. This Chaldean name means “beginning,” as in the verse “and began (shariv) to build” (Ezra 5:2). Now dusk is comparable to the onset of autumn, which is in Tishre. I also found that all the ancients calculated the molad from the beginning of the night.