Equinox Photography 2026: The Week the Sun Sets Due West

The September equinox falls on 23 September 2026 at 00:05 UTC. For roughly a week either side of it the sun rises and sets within half a degree of due east and due west, and that makes this the one stretch of the year when you can work out where the light will land using nothing more than a map. The catch is that the alignment is not exact on the equinox itself. From London the sun sets 0.58 degrees north of true west on the 23rd, and only crosses true west on the 24th. This issue explains why, gives you the right date for your latitude, and flags the two things about equinox week that quietly cost people photographs.

The exact moment, and why your calendar might say 22 September

An equinox is an instant, not a day: the moment the centre of the sun crosses the celestial equator. The US Naval Observatory puts the September 2026 crossing at 00:05 UTC on 23 September. My own computation, run independently for this issue, gave 00:10 UTC, which is inside the accuracy of the abbreviated solar series I use, so the USNO figure is the one to trust and the one quoted throughout.

Because it is a single instant, it lands on different dates in different places. In Britain it is 01:05 BST on the 23rd. In New York it is 20:05 EDT on the 22nd. In Sydney it is 10:05 on the 23rd. That is why American and European sources routinely disagree about the date of the equinox by a day, and neither is wrong.

The sun does not set due west on the equinox

This is the part almost every equinox article gets wrong, and it is worth understanding because it is the difference between a street shot that lines up and one that misses.

Sunrise and sunset are defined by the moment the sun's upper edge touches the horizon. At that instant the sun's centre is about 0.833 degrees below the horizon, partly because the sun is half a degree wide and partly because the atmosphere bends its light and lifts the image. Wind the sun's path backwards below the horizon and, for a northern observer, it slides slightly to the north. So even on a day when the sun's declination is exactly zero, the visible sunset happens a little north of due west.

The size of that offset has a clean closed form: 0.833 degrees multiplied by the tangent of your latitude. I computed the full ephemeris for a dozen locations and it agreed with that one-line rule to three decimal places, which is what makes it safe to publish. It also means the effect is negligible in the tropics and substantial in the north. Here are the visible sunset azimuths on 23 September 2026, where 270 degrees is exactly west:

I checked these against the US Naval Observatory's own celestial navigation data rather than trusting my own arithmetic. For London at sunset on the 23rd the USNO gives an azimuth of 270.587 degrees; I computed 270.584. For Edinburgh, USNO 270.712 against my 270.712. Agreement to three thousandths of a degree, which is far finer than anything you could aim a camera to.

The day your street actually lines up

Two things move in opposite directions across equinox week. Refraction pushes the sunset point north of west, as above. Meanwhile the sun's declination is sliding south at about 0.39 degrees a day, which pushes the sunset point south. The day they cancel is the day the sun sets at true west, and it is a day or two after the equinox in the northern hemisphere and a day or two before it in the southern.

Bold marks the closest day to true west for each place. London, Edinburgh and Reykjavik get it on the 24th; New York on the 23rd; Sydney on the 21st, two days before the equinox.

Now the honest caveat, because a table like this can make you over-plan. The sun's disc is about half a degree across, so a pointing error of half a degree is less than the width of the sun itself. Every date from the 22nd to the 25th will look aligned to a camera. Use the table if you want the sharpest version, but do not skip the 23rd because the maths prefers the 24th, and do go out on more than one evening, because the deciding factor will be cloud rather than arithmetic.

Which cities are actually built for this

The equinox only pays off if something on the ground runs east to west. Street grids are the obvious candidate, and they vary more than people assume.

Chicago works. Its grid is laid out almost exactly on the compass, which is why Chicagohenge happens on the equinoxes themselves and gets a name of its own. If a grid is truly cardinal, the equinox is its day.

Manhattan does not, and this trips people up every year. The Commissioners' Plan of 1811 rotated the grid about 29 degrees east of north to follow the long axis of the island, so Manhattan's east-west streets are not east-west at all. The sun lines up with them at an azimuth of about 299 degrees, which happens roughly 22 to 23 days either side of the June solstice: late May and mid July. That is why Manhattanhenge is a summer event and why the equinox does nothing special for the New York grid. If you have gone looking for it in September, this is the reason you found nothing.

Kyoto works, and it has done since 794. The city was founded as Heian-kyo on the Chinese jo-bo model, a deliberate grid of north-south and east-west avenues, and the main streets have held their alignment for more than a millennium. It is one of the few places where a cardinal grid is the original design intent rather than a coincidence. The narrow machiya lanes between the big avenues give you a frame that a wide American street never will.

Older European cities mostly have no usable grid at all, which is not a problem so long as you stop thinking about streets. Anything straight will do: a pier, a jetty, a canal, a bridge, a Roman road, a valley, a runway seen from a public road, a straight stretch of coast facing west. Rome's consular roads run dead straight for miles. A west-facing beach works everywhere, and the sea gives you the clean horizon that makes the last two minutes of sunset possible at all, which is the same argument the Cornwall autumn issue made about the south-west coast.

Your compass is probably lying to you by a degree or more

Here is the practical trap. You have just read that the sunset sits within a degree of true west, and the obvious next step is to open the compass on your phone and find something aligned. But a compass points at magnetic north, not true north, and the gap between them is called declination.

In London that gap is currently around one degree east and therefore roughly the size of the whole refraction effect described above. That is unusually small; the line of zero declination passed over Greenwich in 2019 for the first time in about 360 years, according to the British Geological Survey, and has been drifting east since. Elsewhere the error is much bigger, running into double figures across parts of North America, at which point a magnetic bearing is useless for this exercise.

On an iPhone the fix takes ten seconds and is off by default: Settings, then Compass, then turn on Use True North. Do it before you go out. A satellite map is the other reliable check, because map north is true north, so you can simply look at whether a street runs horizontally across the screen. Our guide to finding photo spots near you covers scouting alignments this way, and the offline apps issue explains why a sun-position calculation still works with no signal while a satellite tile does not.

Twilight is at its shortest of the entire year right now

This is the finding most likely to cost you a shot, and it runs against what most people assume. The window between sunset and proper darkness is not shortest in winter. It is shortest at the equinoxes, because that is when the sun's path crosses the horizon at its steepest angle and it therefore drops through the twilight zone fastest.

Civil twilight is the useful stretch after sunset when there is still colour in the sky and you can hand-hold a phone. It ends when the sun is six degrees below the horizon. Here is how long you get, computed for the whole of 2026 and reported at the annual minimum and the June maximum:

London gives you 33 minutes of usable afterglow this week against 48 in late June, a third less. Edinburgh loses even more, 63 minutes down to 37. If your habit of arriving a few minutes after sunset was formed over the summer, it is now wrong, and blue-hour shots you took comfortably in July have to be set up before the sun goes rather than after. Practically: be in position before sunset, not at sunset.

Golden hour, the softer stretch when the sun sits below six degrees but has not yet set, is the reverse case and is covered properly in our golden hour guide. On 24 September it opens at 18:10 in London for an 18:54 sunset, 18:17 in Edinburgh for 19:06, 18:27 in Rome for 19:04, and 18:13 in New York for 18:49.

You are losing daylight faster this week than at any other time of year

Day length changes fastest at the equinoxes and barely changes at all at the solstices. For London the peak rate is just under four minutes a day, and it occurs at both equinoxes. That has a blunt practical consequence: a sunset time you looked up a week ago is now wrong by around half an hour, and at high latitude by considerably more.

If you are running a multi-day trip right now, recompute the schedule for each day rather than copying the first evening's times across the week. This is exactly the case a sun calculator earns its place on: the arithmetic is device-local and needs no signal. LightScout can generate a guide with calculated golden-hour context for a chosen place and date, which saves the recomputation, though anything about access, opening times or safety still needs confirming independently.

Equal day and night is not the equinox

The word equinox means equal night, and it is a misnomer. On 23 September, day length is 12h 09m in London, 12h 09m in Edinburgh, 12h 07m in New York. Every one of them is over twelve hours, for the same two reasons as before: sunrise and sunset are measured to the sun's upper edge, and refraction lifts the image so the sun appears to rise early and set late.

The day that genuinely splits twelve hours has its own name, the equilux, and it arrives afterwards in the northern autumn. Computed for 2026, the first day under twelve hours of daylight is 25 September in Reykjavik and 26 September in Edinburgh, London, Rome and New York. In the southern hemisphere it runs the other way, arriving before the equinox: 20 September in Sydney and 19 September in Cape Town.

Near the equator it never happens at all. Singapore's shortest day of the entire year is 12h 03m, and at the equator itself the minimum is 12h 06m. Every single day on the equator is longer than twelve hours, which is a nice illustration of how much work refraction is doing.

What to point it at this week

A short, concrete list. Find something straight that runs east to west, get to the eastern end of it, and shoot back into the sunset on any evening from the 22nd to the 25th. A satellite map is enough to identify candidates in ten minutes from an armchair.

• West-facing coast or a pier. The sea horizon is the only one low enough to give you the final two minutes. Anywhere on the south-west Cornish coast qualifies, as does the west coast of Iceland.
• A long east-west street. Chicago and Kyoto by design, plenty of others by accident. Check the map, not the street name.
• A straight road or canal in open country. The Highlands and any Roman road will do; you want a clear line, not a famous view.
• Sunrise, which nobody bothers with. The same alignment applies due east, and at this time of year sunrise in London is around 06:50 rather than the brutal 04:45 of midsummer. Empty streets, same geometry.
• The full moon on 26 September. It falls at 16:49 UTC, three days after the equinox, and the moon rises close to sunset for several evenings around it. That is a second subject in the same week and it uses the eastern half of the same alignment.

For where the light is worth travelling for over the next few weeks, the September and October issues cover the seasonal picture, including why this October's best meteor night is the 8th rather than the famous 21st.

If you only have your phone

All of this works on a phone, and in one respect works better, because a phone's ultra-wide lens will hold a whole street plus the sun. Four things to do:

1. Turn on true north in Settings, Compass. Otherwise you are aiming at a bearing that is off by a degree in Britain and much more elsewhere.
2. Tap the sun, then drag the exposure slider down. Left to itself the phone will expose for the street and blow the sky out completely. You want the sky correct and the buildings as silhouettes.
3. Turn off HDR-style auto processing if you can, or shoot in the pro or RAW mode if your phone has one. The automatic version will try to rescue the shadows and flatten exactly the contrast you came for.
4. Stay for the twilight, but know it is only about half an hour this week. Our iPhone photography apps guide covers which apps give you manual exposure control.

One last thing, and it is the reason this week is worth putting in the diary at all. For most of the year, working out where the sun will set requires a calculation. For about four days in late September, the answer is west. That is the only time you get to plan a photograph with a map and no maths.