About the Golden Hour & Light Planner
Every photographer knows when golden hour is worth chasing; the hard question is whether this one is worth the drive. This planner does both jobs. The astronomy — golden hour, blue hour, all three twilight phases, solar noon, and the exact compass azimuth where the sun crosses the horizon — is computed in your browser from the standard NOAA solar-position equations, for any place and any date, past or future.
Then the live forecast is laid on top: Open-Meteo's cloud cover, split into the low, mid, and high layers that decide whether a sunset burns or fizzles. A solid low deck scores near zero; a 40% cirrus sheet over a clear horizon is the recipe for the shots that end up framed. The score is a planning heuristic built on those well-documented cloud dynamics — not a guarantee, as any photographer who has watched a “certain” sky go gray knows.
Your location is detected from your connection only to prefill the search; nothing is stored. Times are shown in the location's own timezone, so scouting a shoot nine time zones away just works.
Every golden hour this week, scored from the cloud-layer forecast. Best windows first:
Enter the compass bearing of a street, valley, or landmark line, and find the dates the setting sun aligns with it.
How to Use the Golden Hour Planner
Set your shoot location — search works for any place on Earth, not just cities — and pick a day. The hero shows the evening golden hour window in the location’s own time; the cards below give sunrise and sunset with their compass azimuths, which tell you where along the horizon the sun actually appears. The timeline strip maps the whole day’s light phases, and within the 7-day forecast window the quality cards score each golden hour from the cloud-layer forecast. Planning further out, the sun times still work for any date — only the cloud verdict needs a forecast.
The Geometry: Why Golden Hour Isn’t an Hour
Golden hour is defined by solar elevation — the sun between about 6° above and 4° below the horizon — not by the clock. How fast the sun moves through that band depends on the angle at which it crosses the horizon, which is set by your latitude and the season. At the equator the sun plunges almost vertically and golden light lasts barely 40 minutes; in Reykjavik in June the sun skims the horizon for hours and the “hour” can stretch past midnight. That is also why the tool computes real solar geometry instead of the “first and last hour of daylight” approximation most apps use — at high latitudes the two disagree wildly.
Reading Cloud Layers Like a Sunset Chaser
The difference between a gray fizzle and a sky on fire is almost entirely about which clouds are present. Low cloud (stratus, below ~2 km) sits between you and the sun and simply blocks the show. High cloud (cirrus, above ~6 km) does the opposite: after the sun drops below the horizon it lights those clouds from beneath, producing the reds and purples that peak 10–20 minutes after sunset. The sweet spot is roughly 30–70% mid-to-high cloud with a clear slot on the sunset horizon. The tool’s score encodes exactly this: low cloud is punished hard, a moderate high-cloud deck is rewarded, and precipitation probability drags everything down.
Blue Hour Is the Most Underused Window
The 15–25 minutes when the sun sits 4–6° below the horizon give you a deep-blue sky that meters within a stop or two of artificial lights — the only time city windows, street lamps, and sky balance naturally. Architecture and cityscape photographers often skip sunset entirely and build the shoot around blue hour. Note the asymmetry: in the evening, golden hour comes first and blue hour follows; in the morning it reverses. If you need both, the evening sequence gives you golden light to scout with before the blue window opens.
Azimuths: Where the Sun Rises Matters More Than When
Sunrise azimuth swings enormously through the year — at 40° latitude, from about 58° (northeast) at the June solstice to 122° (southeast) at the December one. A composition that lines up in October simply cannot happen in June. The compass view maps today’s angles, and the alignment calendar inverts the question: give it the bearing of a street or canyon and it returns the handful of dates the setting sun lands exactly there — the same calculation behind “Manhattanhenge,” which is just the day the sunset azimuth matches Manhattan’s street grid at 299°.
Moonlight, Star Fields, and the Dark-Sky Windows
For night photography the moon is either your light source or your enemy. A full moon at 100% illumination washes out the Milky Way but beautifully cross-lights landscapes at 1–2 minute exposures; astro work wants the moon below the horizon and the sun past 18° down (astronomical darkness). The Pro moon card gives phase, illumination, and rise/set times for the selected date so you can find the gap between astronomical dusk and moonrise — the true dark-sky window — before driving two hours to a dark site.
Shooting outdoors all day? Check burn risk with the UV & Vitamin D Planner, or chase night skies with the Aurora & Space Weather Forecast. Browse all Math & Science tools for more.
Frequently Asked Questions
What exactly is golden hour and how is it calculated?
Golden hour is the period when the sun sits between roughly 6 degrees above and 4 degrees below the horizon, so sunlight travels through enough atmosphere to turn soft, warm, and directional. It is computed from solar geometry — your latitude, longitude, and the date — not from clock time, which is why it lasts about an hour at mid-latitudes but can run all day near the poles in summer.
What is the difference between blue hour and golden hour?
Blue hour comes when the sun is between about 4 and 6 degrees below the horizon: the sky glows deep blue while the ground is evenly lit, ideal for cityscapes and architecture with lights on. Golden hour brackets it on the sun-up side with warm, low-angle light. In the evening you get golden hour first, then blue hour; in the morning the order reverses.
Why do clouds matter so much for sunset photography?
The famous burning-sky sunsets need clouds to act as a projection screen — but only the right ones. Mid and high clouds (cirrus, altocumulus) at roughly 30 to 70 percent coverage catch under-lighting after the sun drops. A solid deck of low cloud blocks the light entirely, which is why the tool weights low cloud heavily against the score.
What are the three twilight phases?
Civil twilight (sun 0 to 6 degrees down) is bright enough to work by. Nautical twilight (6 to 12 degrees) shows a horizon line at sea and the first stars. Astronomical twilight (12 to 18 degrees) is nearly full darkness — beyond 18 degrees the sky no longer scatters any sunlight, which is what astrophotographers wait for.
How accurate are the sun times and azimuths?
The solar position math follows the standard NOAA algorithms and is accurate to well under a minute for rise and set times and a fraction of a degree for azimuth. Terrain is the real variable: a mountain ridge or city skyline delays your visible sunrise past the astronomical one, so scout the sight lines the azimuth numbers give you.
