After reading the Book of Esther for the holiday of Purim on Wednesday evening, Jews leaving the synagogue will be greeted by the sight of a supermoon overhead, a phenomenon to which some rabbinic experts ascribe great import.A supermoon occurs when the full moon coincides with the perigee — the closest that the Moon comes to the Earth in its elliptic orbit — resulting in a larger-than-usual apparent size of the lunar disk as viewed from Earth. A full moon at perigee appears roughly 14% larger in diameter than at apogee and appears up to 30 percent brighter. Supermoons usually appear 3-4 times each year.The Purim supermoon will be the final in a series of three consecutive full-moon/ supermoons. The next appearance of supermoons will also be a triad, culminating on the night before Rosh Hashanah (the Jewish New Year).

Source: Purim Supermoon: Countdown to Messiah – Breaking Israel News