The sun sets at 10:08 in Stockholm tonight. What light does to us.

The sun set at 10:08pm in Stockholm last night. In Reykjavik it barely set at all — a dimming rather than a darkness, lasting about two hours before the sky began to lighten again. In Barcelona where I'm writing this, the evenings are long but not extreme: light until about nine-thirty, which is long enough to restructure an evening entirely.

This is the other side of what Marian wrote about in May: the morning light that anchors the circadian clock. This is the evening light that extends everything — dinner, conversation, the children's sense that the day is not finished.

I think about light as a designer. Everything I make is seen in light, defined by it, changed by it. The same object looks entirely different at noon and at dusk, and the difference is not incidental — it's fundamental to what the object is.

The same is true of people and of days.

Midsummer in the Nordic countries is treated as a genuine festival — one of the most important in the Scandinavian calendar — precisely because the light is extreme and temporary. The solstice marks the peak, and everyone who has lived through a Nordic winter knows what it means to have arrived at the peak. The flowers are real. The dancing is real. The particular quality of attention that comes from knowing this will not last is real.

In most of the world, the solstice passes without ceremony. A day that is slightly longer than yesterday, slightly shorter than tomorrow. The peak unmarked.

This is edition 180. Which means we've been doing this for a while, and the number I keep coming back to is the one in the sky: 10:08. The sun setting at 10:08pm in Stockholm, an arbitrary time that is nonetheless completely specific and completely real. A fact that exists regardless of whether anyone notices it.

Most of the facts that matter most in parenting are like this. The way the light changes your child's face in the late afternoon. The particular sound of their laugh at this age, which will be different in six months. The way they hold your hand right now, which is already different from how they held it last year.

The peak is always passing. The question is whether you're present enough to notice it.

Markus and I talked this week about what midsummer actually is — not the festival, but the astronomical fact. The moment when the earth's axial tilt brings the Northern Hemisphere closest to the sun. From this point on, the days get shorter. Imperceptibly at first, then faster, then dramatically.

Children often find this fact distressing when they first encounter it. The longest day is also the beginning of the shortening. The height is also the beginning of the decline.

I have found, over years of parenting, that this is one of the most useful things to know — and to show — to children: that peaks are real, and temporary, and worth being present for rather than protecting against.

We spend a lot of parenting energy trying to buffer children from the experience of things ending. The school year, the holiday, the particular stage they're in that is already beginning to pass. Some of this buffering is appropriate — we don't need to narrate every loss. But some of it prevents children from developing the capacity to hold both things at once: this is beautiful, and it will not last, and both of those things are true and neither cancels the other.

Eat dinner outside tonight. Wherever you are. At whatever time the evening allows. Notice the light. Let your children notice it with you.

What the solstice makes available, if you let it, is a different relationship with time. Not linear time — measured, scheduled, productive — but cyclical time: the return of the same light, the same heat, the same length of day that was here last year and the year before, that will return next year and for every year after that, for longer than any of us can imagine. Children whose experience of time is entirely made of linear time — one thing after another, progress toward goals, the academic year as an escalator moving always upward — are missing a dimension. The cycle is a different kind of knowledge. Standing in the midsummer light is a way of knowing that doesn't require language, or understanding, or any effort at all. Just presence. Just being here, when the light is longest.

That's the whole practice.

When did you last stop what you were doing to notice something beautiful that was temporary?

Not a photo. Not a note to yourself. Just: I stopped, and I looked, and this specific thing was here, at this specific moment, and I was here for it.

What would you give your child this week that asked them to notice something that won't be there next week?

The midsummer light is here now. It won't be here in February.

What is the one thing in the natural world around you right now — this week, this light — that will be different by autumn? Have you named it to your child?

The seasonal marker — one per season, simple enough to repeat.

At each season's peak — solstice, equinox, or whatever feels like the height of the season where you are — do one thing that marks it. Not a production. A moment.

Midsummer: eat outside, as late as the light allows.
Autumn equinox: find the exact moment of equal day and night. Stand outside at that moment.
Winter solstice: mark the shortest day. Light a candle at the exact time of sunset.
Spring equinox: plant something.

What this does over years: gives children a felt sense of seasonal rhythm — not as information, but as experience. The memory of having marked something, repeatedly, becomes its own orientation system.

A reader in Helsinki wrote: 'Midsummer in Finland is the most important time of year for us. How do I explain what it means to my children — not the facts, but what it actually means?'

You don't explain it. You take them to it.

The explanation — the astronomical facts, the cultural history — can come later. What children need from Midsummer is the experience: the fire, the light, the staying up later than makes sense, the adults around them who are visibly happy in a way that isn't about achievement or productivity.

The adults being visibly happy for no particular reason is one of the most important things children can see. It tells them that happiness is not contingent — that it can come from the light being a certain quality, the night being a certain kind of brief, the fire being warm in a particular way. That the world itself can produce joy without any human arrangement of it.

That's what Midsummer means. Take them to it.

— Alex, New York

Edition 180. The sun set at 10:08 in Stockholm. In Barcelona it set at 9:24. I was outside with both of my children when it went. Nobody planned it — we were already outside, and then it was time, and then it happened. We watched it together without saying very much. That's enough. See you Saturday — Marian on the last day of school, which is the other kind of peak.

Names of people and brands in these editions are changed. Whoever was there and reads this knows what we're talking about.

My grandmother grew up in a small town in the north of Spain where the summer solstice was still marked as a genuine community event — fires on hilltops, the particular food that only appeared at that moment of the year. She talked about it as a child not as folklore but as something real and expected.

I grew up in New York. By the time I was aware of the solstice as a concept, it was already information rather than experience. A thing I knew rather than a thing I felt.

I try to correct for this with my own children. Not by recreating the hilltop fires — we're in an apartment in Brooklyn — but by marking it. The noting of the time. The going outside. The recognition that something specific is happening in the sky tonight and we are in it.

A child who has stood outside on the solstice and watched the sky knows something they can't be taught. They've felt the size of the thing. That's not nothing.

— Markus, Barcelona