Tag Archives: Solar Calendar

Is the “Jewish Calendar” Really Jewish?

This week we read a double Torah portion, Vayak’hel-Pekudei, which continues to describe the construction of the Tabernacle and its components. At the same time, we have the special additional reading known as Parashat haChodesh, recounting God’s command to the Israelites to establish the months of the year and observe rosh chodesh. Parashat haChodesh is always read before the start of the month of Nisan, since this is the first month of the calendar (although the new year doesn’t officially start until Rosh Hashanah in Tishrei). It was particularly with regards to the month of Nisan that God commanded the Israelites right before their exodus from Egypt.

Babylonian Calendar

Yet, the term “Nisan” does not actually appear in the Torah. Neither do any of the other eleven months’ names. These names actually come from the Babylonian calendar! Our Sages admit that the Hebrew calendar was adopted from the Babylonians during the Jewish exile in Babylon following the destruction of the First Temple. The Babylonian calendar had essentially the exact same 19-year cycle as the current Hebrew calendar, with a 13th leap month of Adar II added seven times throughout the cycle in order to keep it synced with the solar cycle.

Adopting the Babylonian calendar so directly actually presents a number of interesting issues. The Babylonians named their months based on their idolatrous beliefs. For example, Tammuz was the name of the Babylonian (and Sumerian) god of vegetation. In their mythology, Tammuz died and entered the underworld following the summer solstice, when the length of the days start to decline. Because of this, the Babylonians observed a mourning period in the month of Tammuz, with women in particular weeping in the temples.

In fact, this is mentioned in the Tanakh, where God shows the prophet Ezekiel (8:14-15) a vision of Jewish women mourning for Tammuz by the Holy Temple in Jerusalem!

Then he brought me to the door of the gate of Hashem’s House which was toward the north; and, behold, there sat women weeping for Tammuz. Then said He unto me: “Have you seen this, son of man? Turn around again and you shall see greater abominations than these…”

‘Ezekiel Prophesying’ by Gustav Doré

This passage has God showing a number of abominable acts committed by the Jews, justifying their destruction at the hands of the Babylonians. Technically, Jewish law forbids even mentioning the name of a foreign or idolatrous deity. Yet, Jews to this day refer to the fourth month of the year as Tammuz! And to this day, Jews observe a period of mourning in that month! Of course, this period of mourning is not for the deity Tammuz, but for the destruction of the Temple. The parallels are nonetheless striking.

The Ramban dealt with this apparent contradiction by teaching that it was done on purpose, so that the Jews would never forget their exile. On a more mystical level, mourning for the Temple in the month of Tammuz can be seen as a sort of tikkun, a spiritual rectification for the sin of the ancient Israelites idolatrously mourning the false god Tammuz.

Despite this, there was actually a time when Jews did not exactly agree on their calendar. It isn’t surprising that many weren’t too thrilled with adopting a pagan Babylonian system.

A Strictly Solar Calendar

The Book of Jubilees is an ancient Hebrew text that covers Jewish history from Creation until the giving of the Torah at Mt. Sinai. The book is divided into 50 chapters, with each chapter describing one yovel, “jubilee”, the 49-year period proscribed by the Torah. (Multiplying these values suggests that the Torah was given in the year 2450 according to the Book of Jubilees, which is very close to the rabbinic tradition of 2448.) While Jubilees was not included in the mainstream Tanakh, it was traditionally found in the Tanakh of Ethiopian Jews. It is also evident that Jubilees was used by the Hasmonean dynasty (of Chanukah fame), and influenced a number of midrashim, as well as the Zohar.

It isn’t hard to see why Jubilees was not canonized by the rabbis of the day. The book suggests that those who use a lunar calendar are mimicking idol worshipers, and since the calendar is not precise like the solar one, end up celebrating the Jewish holidays on the wrong days.

A section of the Book of Psalms from the Dead Sea Scrolls

At least fifteen copies of Jubilees were discovered among the Dead Sea Scrolls—more than any other text. The Qumran sect of Jews that produced the Dead Sea Scrolls were clearly at odds with mainstream rabbinic Judaism. They believed that God created the sun and planets with precise orbits, and following these natural cycles reveals His great wisdom. Meanwhile, the rabbis rely on witnesses to spot a new moon before having the Sanhedrin proclaim a new month. The witnesses might err, or it could be cloudy that night, and the calendar would be all wrong!

The Sages responded by citing the Torah (Leviticus 23:1-2):

And Hashem spoke to Moses, saying: Speak to the Children of Israel and tell them, the appointed times of Hashem, which you shall proclaim as holy convocations, these are My appointed times.

God clearly commanded us to appoint the convocations, and whenever we would do so, He would declare them as His appointed times! The Talmud elaborates that God wanted us to reconstruct our own calendar, and the Heavens will reflect our actions here on Earth. There is a far more profound lesson here that our Sages wanted to teach us.

One of the central themes of Passover is that God transcends nature. The laws of Creation can be broken, and inexplicable miracles do happen. Since human beings are made in God’s image, we too are capable of transcending nature. This is our very purpose in life; to break free from the confines of the physical and ascend ever further spiritually.

The Sages established a lunar calendar that would allow people to participate in God’s creation—and teach them that they don’t have to be subject to the strict laws of nature—while at the same time wisely syncing the calendar with the solar cycle to ensure the years don’t lag behind. Ultimately, the calendar was fixed so that we no longer need any witnesses or a Sanhedrin to establish a month. Nonetheless, we celebrate the same holidays at different times every year to remind us of the great potential that lies within each of us; that we are not meant to be slaves of nature, but masters of it.

*For a more detailed analysis of the conflict surrounding the Hebrew calendar, see the third chapter of Barry Freundel’s Why We Pray What We Pray.