In this week’s parashah, Moses and Aaron are given what is considered God’s first commandment: to designate the month of Nisan as the first month of the year.[1] The Jewish people have a unique calendar system that has marked our years and celebrations since then. While many Jews acknowledge this calendar, it typically takes a back seat to its Gregorian counterpart and is used almost exclusively for Jewish holidays and culturally significant dates. Most Jews would struggle to list the Hebrew months in order, identify today’s Hebrew date, or even recall their own Hebrew birthday.
At first glance, a calendar might seem like nothing more than a practical tool. Does it really matter which method we use to write checks, schedule meetings, or mark birthdays? Isn’t the essential thing simply having a shared framework for tracking time?
Kabbalistic teachings, however, suggest otherwise. Our method of structuring and measuring time profoundly affects how we experience it. Time can be viewed as a straight line stretching between past and future, on which we hang life’s events. But it can also be seen as a dynamic, spiraling dimension filled with meaningful patterns that illuminate inner processes, both personal and collective.
The Creation of Time and Mankind
The Torah’s emphasis on time is evident from its very beginning. The written Torah opens with Bereishit, “In the beginning…,” marking the inception of time itself. Similarly, the Oral Torah begins with the word MeEimatai, “From when…,” attempting to position a specific moment in time. As mentioned, the very first commandment given was to designate the month of Nisan as the first of months, inaugurating the Jewish marking of time.
These three beginnings underscore the significance of the Hebrew calendar. Using this calendar aligns us with the many generations of Jews who have marked time this way, forging a connection to our historical and spiritual heritage. In contrast, relying solely on the Gregorian calendar creates a sense of detachment from this lineage, isolating us in the present. Thus, the Hebrew calendar deepens our experience of time by linking us to our past and to the chain of generations stretching back to the Exodus, the birth of our nation.
But the Hebrew calendar doesn’t just connect us to Jewish origins; it harkens back to the very creation of the world. The Hebrew years are counted from the year of the universe’s creation, as passed down in Jewish tradition. Without going into the science-religion debate, we can appreciate the essential idea here: Unlike the other major calendars such as the Gregorian and Islamic ones, which count years from specific historical events, the Hebrew calendar counts from the beginning of history itself.
Indeed, not only do we count years from creation, but the date of Rosh Hashanah, the Jewish New Year, also relates to creation: According to the sages, it marks the sixth day of creation, when Adam and Eve were created. Thus, Rosh Hashanah celebrates not only the cosmos’ beginning but also a particular event within it—the emergence of human consciousness. It marks both the creation of time and a specific event within time, incorporating the principle that guides other calendars.
Remarkably, the phrase “Hebrew date” (תַּאֲרִיךְ עִבְרִי, ta’arich ivri) has the same numerical value as the word Bereishit (בְּרֵאשִׁית)! This connection reminds us that the Hebrew calendar ties us directly to the act of Creation—to the beginning of the world, of time, and of mankind. This awareness encourages us to reflect on the most fundamental question: What will we do with the time given to us?
The Mystery of Intercalation
The Hebrew calendar’s unique essence lies in being lunisolar, i.e. it integrates the lunar cycles that define months with the solar cycles that determine the year and its seasons. This is achieved through what is called sod ha-ibur, “the mystery of intercalation.”
Intercalation becomes necessary because a solar year spans approximately 365 days, while twelve lunar months total only about 354 days. This creates an average discrepancy of around 11 days between the two cycles. The primary function of intercalation is adding an additional, thirteenth month, commonly known as “Second Adar,” in “leap” years. This adjustment occurs roughly every three years (more precisely, 7 times every 19 years), ensuring alignment between the lunar and solar systems. This practice fulfills the Biblical verse regarding the sun and moon: “And they shall serve as signs for the set times, for days and for years.”[2]
Through intercalation, the Hebrew calendar is synchronized with the cycles of both celestial bodies. The months align perfectly with the lunar cycle: Each month begins with the “new moon” when the sky is dark, and its middle features a full moon. Simultaneously, the year as a whole adheres to the solar cycle, ensuring specific months and holidays always occur in their respective seasons.
For example, Nisan is not only a perfect lunar month but also consistently aligns with springtime, staying loyal to its description in the Torah as “the month of spring.”[3] These very words “month of spring” unite the two cycles of lunar months and solar seasons, and indeed intercalation was initially instituted in order to maintain this alignment.
A Balance Between Calendars
The principle of intercalation positions the Hebrew calendar as a midpoint between two dominant calendars in neighboring cultures—the Western Gregorian calendar and the Islamic calendar—neither of which merges lunar and solar cycles.
The Gregorian calendar is entirely solar. While it has months that derive their rough lengths (and name) from the moon, they have long since lost synchronization with actual lunar cycles—the first of each Gregorian month no longer necessarily falls on the new moon. Instead, its 365-day structure aligns only with the solar year (with an additional day, February 29, added every four years to adjust to the precise length of the solar year).
Conversely, the Islamic calendar is purely lunar. While its months align with the moon like the Hebrew calendar, it completely ignores the solar year and its seasons. This results in Islamic holidays being divorced from seasons, with each holiday falling in different seasons each year (Ramadan, for instance, when Muslims fast throughout daylight hours, sometimes falls during short winter days and sometimes during long summer days). The moon is so central to Islam that it has become its main symbol.
The Hebrew calendar thus serves as a bridge between these systems, echoing the fact that both Christianity and Islam originally stemmed from the Torah.
The fusion of solar and lunar cycles carries profound symbolic meaning. According to Kabbalah (and echoed in many cultures), the sun and moon represent the masculine and feminine aspects of the universe, respectively. The sun’s continuous, blazing light, vital yet blinding, symbolizes the masculine principle, embodying strength and constancy. In contrast, the moon, which waxes and wanes, mediating between sunlight and the dark of night, and governing the tides, symbolizes the feminine principle, with its monthly rhythm mirroring the female biological cycle.
This symbolism is illustrated in the gematria of the words for “sun” (חַמָּה, chamah) and “moon” (לְבָנָה, levanah), which equal “wisdom” (חָכְמָה, chochmah) plus “understanding” (בִּינָה, binah)—the sefirot in Kabbalistic thought representing masculine and feminine aspects of God. The interplay of sun and moon thus reflects the perfect union and balance between masculine and feminine forces.
In this sense, the Hebrew calendar itself teaches us the art of balance and integration. It guides us to harmonize the masculine and feminine aspects within ourselves, enriching our consciousness and fostering its growth.
Ayekah? Space, Time, and Soul
The dimension of time is one of three types of dimensions recognized in Kabbalah. According to Sefer Yetzirah (The Book of Formation), reality consists of three categories: three spatial dimensions referred to as olam (literally, “world”), a temporal dimension referred to as shanah (literally “year” or “change”), and an additional, fifth dimension—the soul, nefesh.[4] Modern science recognizes only the first two, space and time, and at some point came to view them as a unified continuum known as “spacetime.” Perhaps one day, science will also recognize the human soul as a dimension.
Sefer Yetzirah lists these dimensions in a specific order—space, time, soul—not by chance. Chasidic writings explain that time serves as an intermediary, connecting space and soul. On the one hand time is inseparable from space, as in the “spacetime” concept, but on the other it is also intimately connected to consciousness: We cannot imagine consciousness without mental processes occurring over time. Consciousness itself cannot perceive reality without perceiving it within time’s framework. Strengthening our relationship with time thus becomes essential to properly linking our subjective consciousness that exists “in here” with the objective reality of the world “out there.”
In this context, we can revisit God’s question to Adam immediately following the sin of the Tree of Knowledge, which symbolizes the onset of human self-awareness. After Adam sinned, God asked him: Ayekah, “Where are you?”[5] On a simple level, this question addresses spatial dimensions: God asks about Adam’s physical location. On a deeper level, however, the question also refers to the dimensions of soul and time.
This deeper meaning is reflected in a famous story involving Rabbi Shneur Zalman of Liadi, the first Rebbe of Chabad. When imprisoned in the Tzar’s prison, his interrogator asked him what God meant by the question ayekah. The Rebbe answered that this question comes to every human being. He said, “When one reaches a certain age, for example”—and here he mentioned the precise age of the interrogator—”God asks him, where are you in your life? Are you living up to the purpose I created you for?” These words deeply shook the interrogator.
As we see, Rabbi Shneur Zalman interpreted the question as addressing the dimensions of soul and time. According to him, the question ayekah represents the beginning of moral self-reflection. God asks where Adam stands spiritually, on the axis of ethics and spiritual progression.
The dimension of time appears in the mention of age, the detail that most affected the interrogator. One should ask where they stand along time’s axes—the day, week, month, year, and lifetime. Are they using time properly rather than wasting it?
In fact, awareness of time acts as the glue connecting the questions “Where am I in the world?” and “Where am I in my soul?” It allows us to integrate our physical location with our spiritual location.
For Jews, the question ayekah must also lead to an inquiry into Jewish identity: Where are you in relation to your Judaism? Even before asking about physical place in space or spiritual state, there’s a simpler question: Are you connected to Jewish time, to the Hebrew calendar by which your people have measured time for generations? To be a Jew means, first and foremost, to think as a Jew. This includes organizing life through a Jewish lens, beginning with how we set dates in our personal calendar.
Aligning with the Hebrew calendar paves the way—consciously or unconsciously—for discovering our true place in life and rectifying our role in the world, both as individuals and as part of the collective Jewish people.
[1]. Exodus 12:2.
[2] Genesis 1:14.
[3] Deuteronomy 16:1.
[4] Sefer Yetzirah 3.
[5] Genesis 3:9.
