t should be pointed out that the Jewish calendar leap year designations are NOT Biblical.
Let's add a little more detail: The spring equinox occurs on March 20th at 4:40 PM, Jerusalem time. The Jewish calendar calculates the new moon of Adar II (the 13th month of the previous religious calendar year) to be at 9:31 PM on March 8th and, due to the postponements of the previous Tishri 1, March 11th as the first day of the month. Either day will place the 14th day of Adar II on or after the spring equinox and thus the month should be Nisan (Abib), not Adar II. The result of this error is that the Jewish calendar is ONE MONTH LATE from March 2016 through March 2017! By making 5776 a leap year, they ignore the fact that, by their own interpretation of the Torah, Passover must be observed at the first opportunity on or after the spring equinox. This is the way the lunar calendar is kept synchronized with the solar calendar, and is an essential part in keeping the Passover (and every other Holy Day) in its season