By Aaron Mandel
It is late on a Friday afternoon, and you are watching the light change. You meant to be ready by now, and you are nearly there, but a small uncertainty keeps tugging at you: when, exactly, does Shabbat begin? Is it the moment the sun touches the horizon, the moment the candles are lit, or some quieter threshold you cannot quite see? You want to greet the day rightly, not stumble into it by accident. That wish, to meet holy time on purpose rather than miss its edge, is itself the beginning of keeping it.
The good news is that Jewish time is not measured by a wristwatch or a fixed hour on a calendar. It is measured by light. And once you learn to read the light, the question of when Shabbat starts stops being a logistical worry and becomes something closer to a practice of attention.
Why the Day Begins in the Evening
The first thing to understand is the most surprising: in Jewish reckoning, a day does not begin at midnight or at dawn. It begins at nightfall, the evening before. This is not a later custom layered onto the calendar; it is woven into the very first chapter of the Torah. At the close of each day of creation, the same refrain returns. “And there was evening and there was morning, a second day,” (Genesis 1:8). “And there was evening and there was morning, a third day,” (Genesis 1:13). Again at the fourth day, (Genesis 1:19), and the fifth, (Genesis 1:23). Evening is named first, then morning.
So the Jewish day runs from one nightfall to the next. Shabbat, which the Torah commands you to “remember” and “keep holy” (Exodus 20:8), therefore does not begin on Saturday morning when you wake. It begins on Friday, as the light fails. The Sabbath of rest opens in the gathering dark and carries you through the next day until the dark returns. If you have ever felt that Shabbat arrives like a tide rather than the tick of a clock, you were sensing something true about how the tradition tells time.
Candle-Lighting and Adding to the Holy
In practice, Shabbat does not begin precisely at sunset. It is welcomed a little earlier, with the lighting of candles, customarily around eighteen minutes before the sun sets. This early lighting expresses a beautiful principle called tosefet Shabbat, “adding to the Sabbath.” You take a few minutes that legally still belong to the ordinary week and you give them to the holy. You meet Shabbat slightly before it is strictly required, the way you might step out to the gate to greet a guest you love rather than waiting for the knock.
This instinct to honor the edges of sacred time runs deep. The tradition tells of one sage who would deliberately wear plain, dark clothing through the week so that his fine Sabbath garments would shine all the more by contrast. As the Mesillat Yesharim records, “Rav Anan wore black overalls, ie. he would wear a black garment on Friday so that the honor of the Sabbath would be more recognizable when he donned fine clothing” (Mesillat Yesharim 19:68). The point is not the wardrobe. It is the preparation, the leaning-forward, the deliberate marking of a boundary so that you cross it awake rather than asleep. Candle-lighting is that boundary made visible: a small flame kindled in the daylight that remains, declaring that ordinary time has ended and rest has begun.
When Shabbat Ends, and Why We Wait for Stars
If Shabbat begins as the light fails on Friday, it ends as the dark fully arrives on Saturday. But here the tradition asks for patience. Shabbat does not close at sunset on Saturday evening; it closes a little later, when three medium stars appear in the sky, a moment called tzeit hakochavim, “the coming out of the stars.” Twilight is an in-between, neither clearly day nor clearly night, and so we hold the holy a few minutes longer rather than release it too soon. Where you added time at the start, you add time again at the end.
This is why you cannot simply glance at a sunset chart and call the day finished. The Sabbath leans on the same rhythm that opens it, evening and morning, and asks you to wait for the night to be unmistakable. There is a tenderness in this. We are slow to take up the burden of the week again. We let the rest linger until the stars themselves tell us it is time.
Kiddush and Havdalah: Speaking the Edges Aloud
These two thresholds, entrance and exit, are not left silent. At the table on Friday night, Shabbat is sanctified in words over a cup of wine, in the prayer called Kiddush, which recalls that God blessed the seventh day and made it holy. And as Shabbat departs on Saturday night, we mark the close with Havdalah, “separation,” a brief ritual over wine, spices, and a flame that names the line we are crossing: between the holy and the ordinary, between the day of rest and the six days of work.
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Together, Kiddush and Havdalah are like two doorframes, one at each end of the day. They keep Shabbat from blurring into the week on either side. The same impulse that lights candles eighteen minutes early and waits for three stars at the close is here given a voice. You do not merely slip into rest and slip out of it; you announce it, you bless it, you say the boundary aloud so your heart knows where it stands.
Living by Light Instead of the Clock
There is a deeper gift hidden in all of this. To keep Shabbat by sunset and starlight is to be retrained, week by week, away from the tyranny of the clock and back toward the rhythm of creation itself. The Psalmist already knew this older clock, marking the soul’s turning to God by the sky’s own hours: “Evening, and morning, and at noon, will I complain, and moan; and He hath heard my voice” (Psalms 55:18). Life is measured in light and shadow, in the daily arc that rises and sets, “in the morning it flourisheth, and groweth up; in the evening it is cut down, and withereth” (Psalms 90:6).
When you begin to live this way, the anxious question of the exact minute softens. Yes, you check the candle-lighting time; yes, you watch for the stars. But the watching itself becomes the practice. You start to notice the light again, the long gold of a Friday afternoon, the first faint star on a Saturday night. The day stops being a number and becomes a presence you can feel arriving.
So if you are standing now in the changing light, unsure of the moment, know that the uncertainty is not a failure. It is the doorway. Light your candles a little early. Wait for the stars before you let go. Speak the blessing that names the edge. The exact minute matters less than the willingness to meet the day awake, and that willingness, repeated week after week, is what it means to remember the Sabbath and keep it holy.
Published by Higgayon Press. For questions of halacha, consult a qualified rabbi.