The Jewish day and week

Time becomes part of our service

Jewish life does not happen only when we open a book or enter a synagogue, a place of communal prayer. We serve Hashem, “the Name,” our customary way of referring to God, through the movement of ordinary days. We pray, work, learn, share meals and prepare for Shabbat, the seventh day of the week, set apart for Hashem.

A civil calendar changes its date at midnight. Our calendar and the times of our mitzvot, commandments, ask us to notice other boundaries too: evening, morning and the changing light. Two questions will help you keep your bearings: Which day are we in? And which part of that day does this practice belong to? They are related questions, but they are not the same.

You will learn a map, then use it to explain a small case. Keep paper nearby. The English readings contain everything needed for the exercises.

One word, two uses

The Torah, the five books of Moshe (Moses), opens with creation. In Genesis 1:5, notice what God calls the light, and then what the verse counts after mentioning evening and morning.

Yom, יום, means “day.” At the opening of the verse, it names the light in contrast to night. At the end, “one day” counts the whole evening-and-morning sequence. English also uses “day” in more than one way: “I worked during the day” differs from “I stayed for three days.”

This distinction matters when we learn. A commandment assigned to the daytime does not become a nighttime practice simply because night belongs to the same calendar date. Read the source’s own time words rather than giving every use of “day” one meaning.

The night belongs with the coming daylight

For Shabbat and the festivals, we reckon the night with the daylight that follows it. Friday night is already Shabbat, as Saturday daytime is. Midnight does not start Shabbat, and Saturday sunrise does not start it either.

One clear Torah example of an evening-to-evening observance appears in the instructions for Yom Kippur, the Day of Atonement. Leviticus 23:27 identifies the tenth day of the month. Verse 32 tells us to begin with the preceding evening:

The immediate subject is Yom Kippur. Notice how the passage teaches its boundary by naming evening, rather than assuming the observance starts when people wake up. It gives us a concrete example to read, not a formula that decides the times of every mitzvah.

Notice the changing light

“Morning” and “evening” are useful broad words. Our sources also distinguish more precise landmarks. Begin with their order, not a calculation.

Dawn · alot hashachar

The first light of morning, before the sun rises. You will also meet the expression amud hashachar, the “column of dawn.”

Sunrise · hanetz hachamah

The sun appears at the horizon. Dawn and sunrise are different landmarks.

Sunset · shekiat hachamah

The sun goes below the horizon. Sunset does not mean that the sky has already become fully dark.

Nightfall · tzet hakochavim

The emergence of the stars, a marker of night. Our sources distinguish it from sunset.

Bein hashmashot is twilight, the transition whose status as day or night our sages discuss. In Shabbat 34b, the discussion treats this status as uncertain rather than simply identifying twilight with ordinary daytime or definite night.

Rambam, Rabbi Moshe ben Maimon, organizes Jewish law in his code, the Mishneh Torah. In Laws of Shabbat 5:4, he describes the transition from sunset until the appearance of three medium-sized stars, then says:

This is why “the Jewish day begins in the evening” is a useful orientation, while “every time question is settled at sunset” is not. In practice we welcome Shabbat before Friday’s sunset and keep it through Saturday’s nightfall. Shabbat lights are lit before sunset; Rambam states this in 5:3. A community’s candle-lighting time and Shabbat-ending time are different entries, not interchangeable names for sunset.

For the actual times where you live, ask your rabbi which local calendar and practice to follow. Here, the skill is to recognize what a time label means and what it does not mean.

Three familiar meeting points

A siddur is our prayer book. Its daily services bring us back to Hashem at recurring points in the day. Learn these three names:

• Maariv, also called Arvit: the evening service.
• Shacharit: the morning service.
• Minchah: the afternoon service.

Rambam connects these prayer settings with the service of the Temple, our sanctuary in Jerusalem, in Laws of Prayer 1:5–6. The rhythm joins our present prayer to our people’s worship across generations.

The service names help you find a section of the siddur. They do not supply all its earliest and latest times. The Mishnah, a collection of our sages’ teachings, makes a similar distinction between broad settings and precise limits: Megillah 2:4–6 distinguishes dawn from sunrise and discusses practices assigned to the day or the night. A whole calendar day contains both, but a particular practice has its own place.

For a guided look inside the book, continue with Find your way in the siddur.

A week oriented toward Shabbat

In Hebrew, the ordinary weekdays are numbered. Yom rishon means “first day,” not “first workday.” Sunday is first; Shabbat is seventh. The English names below identify the familiar daytime; the Jewish calendar day includes the preceding night.

1. Yom rishon, first day: Sunday.
2. Yom sheni, second day: Monday.
3. Yom shlishi, third day: Tuesday.
4. Yom revi’i, fourth day: Wednesday.
5. Yom chamishi, fifth day: Thursday.
6. Yom shishi, sixth day: Friday.
7. Shabbat: the seventh day, Saturday.

You can hear this rhythm in Mishnah Tamid 7:4, which records the psalms the Levites sang in the Temple. It moves through “the first day,” “the second,” and onward, then says “on Shabbat.” The Levites were members of the tribe of Levi with responsibilities in the Temple, including its song.

The week is more than seven identical boxes. In Genesis 2:1–3, Hashem blesses the seventh day and makes it holy. Our preparation, prayer and rest answer that gift. “Holy” means set apart for Hashem, not merely unusual or free of appointments.

Work through an invitation

A family invites Leah for “Shabbat evening and Shabbat morning.” She wonders whether these are two different sacred days. Work through the question in three steps:

1. Identify the cycle. Shabbat is the seventh day of the week, not a name for two separate dates.
2. Join the night to its daylight. Friday night and Saturday daytime belong to that Shabbat together.
3. Keep the gatherings distinct. An evening meal and a morning service have different settings even though they belong to one Shabbat. Leah still asks her hosts when and where to arrive.

Now transfer the reasoning to an ordinary weekday.

Return tomorrow

Before looking back, explain the difference between a calendar day and daylight. Name the morning and evening pairs of light markers. Then say why Friday night belongs to Shabbat.

Return to the sources

• Genesis 1:5 and 2:1–3: day and night; the seventh day’s blessing and holiness.
• Leviticus 23:27, 32: Yom Kippur and its evening-to-evening observance.
• Babylonian Talmud, Shabbat 34b and Rambam, Laws of Shabbat 5:3–4: twilight, lights before sunset and definite night.
• Mishnah Megillah 2:4–6: distinct time markers and daytime or nighttime practices.
• Rambam, Laws of Prayer 1:5–6: daily prayer settings.
• Mishnah Tamid 7:4: the week’s psalms; this reader also labels the passage 6:7.