As shown, for instance, by the Sardica paschal table, it was quite common at that time that the Jewish calendrical year started before and after the equinox according to Exodus 12:2 and Deuteronomy 16:1  In case the previous year had started after the equinox, two Passovers would be celebrated in the same solar year (the solar New Year was starting on March 21). But the Ancient Hebrew calendar is based on the New Moon and the Aviv barley, not the Solar calendar. Note: (The word Month being Hebrew Chodesh which literally means New Moon which is referenced in Deuteronomy 16:1) . Since the 3rd century this disorder of the "Jewish" calendar of the time was lamented by several Christian writers, who felt that the Jews were often using a wrong lunation as their Nisan month and advocated the introduction of an independent computus by the Christians.