As we prepare to usher in a new year, we remember that while our calendar follows lunar months, it is still synchronized to the sun over the course of a 19-year cycle. Since a lunar month is 29.5 days, each month on the Hebrew calendar is either 29 or 30 days, resulting in a year that is typically just 354 days long. The solar year is a bit over 365 days long, meaning that a strictly lunar calendar will fall behind 11 days each year. To avoid this problem, we add an entire leap month, a second Adar, seven times in 19 years. This ensures that we stay in synch with both moon and sun. The upcoming year will be such a leap year, with 13 months instead of 12.

Although our calendar is lunisolar, and Jewish holidays, rituals, and halakhot generally follow this calendar, there are exceptions to the rule. In fact, there are a handful of Jewish laws and principles that follow not the lunisolar calendar, but the solar calendar of 365 days! We will explore some of the major ones below, and then look at the Zohar’s incredible revelations about the secrets of the solar calendar. Continue reading →